There are two basic variations of the genre. Some games allow you to place towers anywhere, and the towers form the path the creeps will traverse (e.g. Fieldrunners). Others like geoDefense lay out a path for the creeps and allow placement of towers anywhere except on the path. This is my favored style. I prefer to concentrate on the strategy involved in placing towers rather than placing towers and constructing the most effective path.

The place where geoDefense does the best at differentiating from other tower defense titles is its look. The graphics harken back to the vector graphics of old arcade games like Asteroids and Battlezone. This is an often used style, but the explosions in this game are really a sight to behold. At its more frenetic moments, the player will be treated to hundreds of colored particles exploding around the screen as he lays waste to hordes of creeps.

Unfortunately, the game takes few chances overall. There are a few new towers I haven’t seen in previous TD games (like a tower that collects energy from creep explosions feeding it back to towers for more powerful shots), but this does little to provide incentive to purchase this title over and above similar games on the app store. Towers are sometime introduced (and taken away) for particular missions which adds another layer of strategy to the game.

Disclosure: I am not and will not ever be competing on the pro circuit in strategy games. That said, I found this game more difficult than most. This is not a bad thing. Usually, I expect to coast through several waves of creeps in a new TD game. In geoDefense, I found myself scraping by even in the early levels on easy mode. I then tried the medium levels and found that they were very similarly difficult. The feeling ov even difficulty across easy and medium difficulties could have been because I became more skilled playing the easy levels and was better prepared to play on medium. The hard levels do feel significantly more difficult. This is where I first experienced the game actually removing access to a tower. It certainly achieved its desired effect.

In short, geoDefense is an excellent example of what it is: a simple tower defense game with excellent graphics. I would love to recommend it more highly because I really do think it is an excellent game. However, it takes virtually no risk and sticks to well-established conventions of tower defense games. I don’t necessarily need genres to be blended or anything like that, but I think there are some simple elements that could be added to make the game more compelling. I would love to see some sort of progression where it feels that my play in one scenario will actually affect my standing in the next. That would be a relatively simple feature that, if balanced properly, could really provide some incentive for reply.

Zen Bound allows the player to manipulate a wooden object by way of touch control. A rope is stretched from the screen to the object at an angle determined by the accelerometer. Players twist and turn the object to wrap the rope around it. The goal is to touch as much of the object with the rope as possible while soothing music plays in wonderfully separated stereo. There are two modes. As best I can tell, the difference is in the types of objects you are given to bind. The Tree of Reflection presents the player with a series of representative objects (usually animals carved from wood) while the Tree of Challenge contains more abstract and geometric shapes. As you bind the objects, they become “painted” a different color. The unpainted portions are those still left to touch.

It sounds like a very simple concept but there is really a lot of strategy involved. I can’t just string my rope anywhere as I might bridge the rope over portions of the object that I will then be unable to touch later. Also, you are limited to a length of rope for each object forcing you to be economical with your use of it. Each stage has three flowers the can be attained. The first at 70% coverage, the second at 85%, and the third at 99%. It is possible to obtain all three at once by achieving 99% on your first completion of a level. Flowers accumulate to grant access to new stages higher up each tree. A level is completed by tying a second nail that begins glowing when you have reached the first completion level (70%). This adds another level of challenge as the level will end as soon as the rope makes contact with the nail after reaching at least 70%. If you want to achieve the second or third level of completion, you will have to avoid the second nail until you reach your desired coverage.

The graphics are simple but beautiful. Granted, this isn’t a game with high polygon count models, but the models are beautiful and serve the purpose perfectly. The style of the art is complementary of the music. Everything feels relaxing and very… well, zen. The game opens with a text message which says that it is designed for use with headphones. Please take this to heart because the iPhone speaker does not do justice to the wonderful music in this game.

There are currently 6,000 games on the app store. Far less than 1% of those are entertaining. Less than 1% of those are unique. This game is in that 1% of 1%. I implore you to reward developers that think outside the box and toss out the tropes of gaming that have been established over the past 30 years. Zen Bound is an incredibly unique and rewarding experience that should appeal to nearly everyone.

You will not find yourself running out of things to do here. At any given time, you will probably have multiple quests which can be completed in any order. There are townspeople to talk to. The game employs a day and night cycle which will actually have bearing on what you may do in the game. There is so much here it would be impossible to cover it all.

The game’s interface is a success in some areas and a failure in others. Movement can be accomplished in one of two ways: via the on-screen arrows or by gesturing on the actual viewport. The game recognizes six different movements: forward, backward, sidesteps left and right, and turns left and right. Arrow movement is straightforward; there is an arrow for each movement type. Gesture movement is less obvious but still fairly intuitive; swipe up to move forward, down to move backward, left or right for sidesteps, and diagonals for turning. Navigating the world is pretty easy using this system. Games like this are obviously better suited to a mouse and keyboard, but this is a good implementation given the platform. The inventory system is a bit unintuitive. When shopping or picking up an item,  the game allows you to switch between viewing your own items and the other party’s items (be that party a seller or the ground) by way of a pair of curved arrows. Unfortunately, it is not immediately obvious (at least to me) which arrow is which. The green arrow pointing up will display the other party’s inventory while the yellow arrow pointing down displays your own.

Combat is turn-based and simple enough to execute. Simply face your target and tap the attack button to perform a single attack after which the enemy will have an opportunity to either move or perform an attack on you. There is a little luck involved and health potions are strongly recommended.

I can’t recommend this as a game for the masses. Not everyone will enjoy it. It appeals to a small albeit devoted audience. However, for RPG gamers, this is a game that is hard to find on the go. A game with the depth of The Quest on a mobile platform is a real treat. It’s not without it’s problems, but those can easily be overlooked by anyone looking for a substantial RPG to play on the go.

Vector Tanks is an iPhone game that seems to appeal to the nostalgia of former Battlezone players. I have very little connection to the source material here so I look at it through a different lens than would a player of the original Battlezone. It was released about three years before my birth, and, although Wikipedia says its popularity was enduring due to the innovative nature of the graphics and perspective, it had long since been retired into gaming lore by the time I began my illustrious career as a gamer. Vector graphics were a fad that didn’t endure (although the style was revived for the Geometry Wars series).

It has a look very authentic to that of it’s inspiration. In fact, the presentation is slightly improved. It is more colorful, and the lines have sort of a glow about them which is a pretty cool effect. Explosions are cool and feel large with the entire view shaking as an enemy tank explodes.

The control scheme has been well-adapted to the platform. I can’t imagine a better way to translate the controls of the original. The extreme left and right edges of the screen control movement of the left and right tracks. The middle of the screen on each edge is neutral—no movement is taking place. Slide either side to the top and that track will move forward; slide to the bottom and that side moves backward. It’s a pretty intuitive system. I have to say that, even though authenticity is not compromised, the controls are not entirely satisfying. It seems that sometimes the tracks do not move even though my fingers are tracing up and down the sides. This two-finger movement scheme is also problematic when it comes time to fire. Firing is accomplished by tapping the middle of the screen at the aiming reticule. In order to fire while moving, you must snake an extra finger (since your thumbs are occupied) around to the screen and tap on the center. Not only is this difficult to do, but it obscures much of the screen from view while firing is taking place. I guess this control setup was the best way to please the purists, but, on its own, the controls don’t hold up to much extended play.

Be prepared to see this screen quite a lot.

There is no narrative and no progression to the game that I can find. In the style of older games (and even still with newer arcade games) you are merely presented with a simple gameplay mechanic and given an opportunity to repeat it until you run out of patience (quarters being the arcade analog). This leaves a shallow gaming experience with no “carrot-on-a-stick” to keep me coming back.

I’m certainly glad I got to try this game. It has an undeniably cool and retro look. I imagine players of the original will enjoy the ability to play an old favorite on the go. Also, unlike many retro titles, Battlezone is a well that has not been tapped very often leaving the experience feeling fresh. It’s unfortunate that the controls seem to get in the way of enjoying the game. It’s doubly unfortunate that there seems to be no reason to continue playing unless you find the play mechanics themselves particularly satisfying. Some games are perfect for adaptation to the iPhone platform. Others like Vector Tanks are best left elsewhere.

Of course, the iPhone does not have the “twin sticks” from which the genre derives it’s name. Instead, like others that have come before, the developer had to devise another control mechanism. iDracula uses two on-screen directional controls giving it razor-accurate response. Per convention, the left side controls your character’s movement while the right side controls firing. The controls are rarely obtrusive and are positioned to still allow for a large play area while still being large enough to facilitate intuitive controls. It’s easy to find where your thumb needs to be to move and/or fire in any given direction.

The game comes with two modes: “Rush” and “Survival.” Rush mode throws you right into the fray. At all times, you’ll be surrounded by tons of monsters, and, armed with your machine gun and unlimited ammo, you’re tasked with mowing down as many as possible. This is the game mode for a quick play session. If you just have a minute or two to play, fire up “Rush” mode to dispense with all the foreplay. Throughout my play in this mode, there isn’t really any progression. That’s where “Survival” mode comes in.

“Survival” mode is the meat of the game. This mode couples the frantic arena shooting with RPG-like progression to give players a surprisingly robust experience. The mechanics are identical, but there is real progression here and incentive to play for more than a few minutes. You start with a handgun, and you’re looking at two or three shots to kill the weakest enemies. Luckily, the enemies will trickle in slowly at first to ease you into the action. Before long, the pace will pick up, new and stronger enemies will be introduced, and you’ll most likely have found a better weapon just about the time you were thinking you weren’t going to hold up much longer with just the pistol. The game seems to be intelligent about when new weapons are dropped so that you never feel like you are either underpowered or overpowered. You also have to manage ammo, but, honestly, once you start getting new weapons, ammo is not tough to find either although you may not necessarily find ammo for the particular weapon you want to use.

The progression comes in other forms as well. Perks are iDracula’s analog to leveling and learning new spells in an RPG. After a number of kills, you will see the perks icon light up in the top-right of the screen. Tap it to access a menu with four randomly selected upgrades like the ability to do more damage when your life gets low or a greater maximum health. These upgrades are persistent throughout your play session. In addition, you will periodically encounter Dracula. He is much tougher than the other enemies. If you defeat him, you are awarded with a shard. Collect shards to advance in rank. Unfortunately, rank is purely superficial; it’s nothing more than a word displayed at the end of the statistics screen displayed when you die leaving little incentive to strive for higher rank.

Now this is sounding like more of a timesink, right? Luckily, the developer considered the habits of mobile gamers and included an autosave that will allow you to resume your game after you have closed the game (or received a call). There is an in-game pause button as well, which is also convenient from time-to-time.

My complaints are few and minor. The character’s lower body moves completely independent of the upper body which creates some wacky-looking scenarios such as running full-speed forward away from monsters while your torso is facing and aiming in the exact opposite direction. The character’s feet should always be within a 90° radius of the direction of his face, but that is not necessarily the case here. I would love to see some sort of narrative and a progression through that narrative although that is a bit much to ask of a game at this price-point. (Maybe in the sequel?) An audio cue for perks would be nice. I often don’t know until I glance at the top-right of the screen that I have perks available. Finally, it is somewhat difficult to switch weapons in the game. The task itself is simple, but it requires diverting one of your thumbs from a directional control to execute. This is often dangerous by the time you might want to switch weapons because of the frantic pace of the game. To halt either firing or moving at these times is virtually suicide.

I’m really excited to see more from this developer. This is a near-perfect mobile gaming experience for players craving a bit more in the realm of hardcore gaming experiences on the iPhone. It is a genre-bending title that expertly melds a game well-suited to short, quick play sessions with some elements that make it worth coming back to. The game is currently $.99 at the time this review is published and will be for a little while longer. The developer is also promising some meaty additions (like a new game mode) in an upcoming update. The regular price is $2.99. It’s an incredible value at either price, and I’m sure iDracula will remain on my home screen for some time to come.

Payback ($6.99)- Payback is a very true-to-the-original GTA clone. I’m sure many of you are only familiar with the GTA series since the third game in the series was released for PS2. This is a little different. This game is very similar to the first two GTA titles for PC (also for PSOne, I believe). The perspective is top-down. You go to phone booths, pickup missions, and complete them for points. Once you reach the point goal, you can move on to the next area. I have a couple of minor complaints. The light poles in the game do not come down even if you hit them with a tank… literally. Not only that, but they stop your vehicle immediately and completely upon impact. The cops in the game are very nonchalant. You can often steal another car in front of them, run over someone, or run into their cop car with your vehicle without raising their suspicions that you might be up to no good. In spite of this minor gripe, this game is definitely a steal. There is spoken dialog and a cool radio just like modern GTA games!

ExZeus ($5.99)- This game comes straight from Japanese arcades. The PS2 version was released only in Europe. The Dreamcast also saw a version at some point in time (probably on a continent on which I do not reside). This is a shoot ‘em up that puts the camera behind a giant mech which you move on the x and y axes using tilt control. Attacks are executed using a number of tapping gestures on the right side of the screen. Tapping the left side of the screen locks enemies for a homing-rocket attacks. It’s great fun and and very polished especially well under the $10 price point.

I Love Katamari ($7.99)- The Katamari series has held a special place in my heart since the original Katamari Damacy for PS2. This particular version was destroyed by critics upon release because of some major slowdown issues, but those were fixed shortly after with the first update. For anyone unfamiliar with the series, you play as the Prince who is sent to earth by his father, the King of the Cosmos, to roll around a giant sticky ball called a katamari and pick up objects. These objects range from paperclips and matchboxes to tables, people, and much larger objects still. While the katamari is small, it can only pick up small objects, but, as it gains mass, it can pick up much larger objects. There are a number of modes including the story mode in which the King asks you to roll up a specific object in each level and a mode which has you trying to stop rolling when your katamari reaches a given size. It is wacky, but it is simple addictive fun.

Rolando ($5.99)- Here we have a super-cute and complete platformer that uses the accelerometer to great effect. The graphics could probably be duplicated in Flash, but the tilt control upon which the game is built is uniquely its own. It also contains a level of polish that few Flash games ever achieve. Roll your Rolandos through each stage solving puzzles and overcoming obstacles to reach the exit. Some stages also have elements that you interact with directly by touch. Each Rolando has a unique personality which makes the game more endearing than most you will play on this platform. Start with the lite version and see if you like it.

SimCity ($7.99)- This is SimCity 3000 adapted for the iPhone. It is an excellent and complete version of the game. Amazing to me is that the game was not watered down for the mobile platform. This isn’t SimCity “Lite.” You’re out there zoning, placing roads and water lines, and talking with advisors just like its desktop counterpart. Maybe this experience could be reproduced in Flash, but it never has to my knowledge.

This list is not meant to be comprehensive. Nor am I trying to suggest that you should not buy simpler games on the platform; they certainly fill a need as well. However, as a hardcore gamer, there is a thirst in me that no quantity of puzzle and card games can ever quench. Lucky for me (and those like me), the iPhone offers a powerful gaming platform that developers (like those of the aforementioned titles) have really begun to exploit to the fullest. These are some of the finest examples of exactly what the iPhone is capable of in the mobile gaming space.

This is one such case: a game that launched to a number of good reviews including the aforementioned TouchArcade review. It looked cool enough—even slightly reminiscent of Metal Slug. If you like action arcade games, you should own this game especially considering the bargain price.

There are a number of good things to say about the game, but I will start with a few minor complaints. I believe the game could use a little more guidance. It actually took a while before I realized I was controlling the movement of the tank. The game seems to calibrate the acceleromter control such that holding the phone level moves the tank forward to the right. I thought the game was just setup so that the tank proceeded through the level automatically. It wasn’t until I reached a boss that I could not defeat in the time it would have taken me to proceed past him that I realized I could tilt to move backward or maintain my position. It also took a while to figure out how to jump. I knew I could jump after watching a video of the game in action, but it took a bit of fiddling to realize I needed to tap the lever. It also isn’t immediately obvious that the position of your tap on the screen controls the trajectory of your shot since most players will naturally tap in the direction of enemies anyway. Also, I recently discovered I have a double-jump. I discovered this after upgrading my movement so I’m not sure if this was a feature added in the upgrade or if I had just missed it before.

My only other substantive complaint is that it is a bit difficult to change weapons in the heat of battle. As it stands, the player taps on the weapon icon on the HUD to scroll through the available weapons. You can gain access to quite a few weapons at a time which makes it a bit tedious to scroll all the way through the options while also dodging fire from three or four on-screen enemies.

Others have mentioned that the in-game “Menu” button does not work which I’m sure will be fixed soon. It doesn’t really have a profound effect on the game although it would be nice to have a way to pause the action which I’m sure this button would provide.

There are far more good things to say about this game. As I mentioned, the game seems to calibrate so that holding the phone level advances your tank. You will find yourself moving forward more often than not so it is helpful to be able to hold the phone in the neutral position to accomplish this. Even the acceleromter controls are very tight. This comes from the fact that there are only three states: moving left, moving right, and not moving. It’s very easy to move around. The rest of the controls are simple. I found myself sometimes having trouble finding the jump lever while also watching the action on the screen, but this was rare.

There are two basic mechanics in the game: shooting enemies and dodging enemy fire. Shooting is simple to execute by tapping in the direction you wish to fire. Dodging is very challenging because there are often multiple enemies firing shots that take different trajectories. Although this can get a little hairy at times, it never feels cheap. You can almost always escape death by manuvering with skill. Some enemies also drop crates that contain weapons, powerups, or health pickups to get you through the tough parts.

The sound effects in the game are satisfying. Explosions, bullets, and missles all feel “large” as they should. The game doesn’t have music which makes it a bit of a bummer that it stops the music from the iPod app when you launch the game.

This is currently one of my favorite action games on the platform alongside Chopper, 2079, and Blue Attack. If you’re looking for a quick and satisfying action experience on the go, I can’t imagine Heavy Mach. would disappoint you. New levels are promised in a free update to this game that already oozes value from every orifice. Tomorrow morning, ditch Starbucks for the local convenient store coffee and spend the savings on this!

Heavy Mach. on iTunes

For years, indie gaming has been primarily a PC affair. Console development has had too many barriers for small-time developers to be able to even consider as a viable platform. Of course, there have always been the stories of the game developed by the guy in his mom’s basement that was discovered by someone and turned into a full-fledged console release, but that is the exception not the rule. In the past year, this has started to change slowly. Microsoft has released its development kit and launched Community Games on Xbox Live which is a platform for indie developers to release and sell their creations. The iPhone has also offered a successful and accessible platform for indie developers. Most indie games are still on the PC, but the industry has seen the value in indie games and is making inroads to having them on a multitude of platforms.

GemCraft is a deep tower defense game built in Flash and playable in the browser

Possibly the most popular platform of all for indie gaming is the web thanks to the Flash browser plugin. There are hundreds of sites that focus solely on providing a Flash gaming playground with titles spanning every genre you can imagine. Because of the ubiquity of Flash, these games are accessible to almost anyone with a computer of any kind. They reach levels of sophistication that are very close to that of applications native to a particular hardware platform and offer something for casual and hardcore gamers alike.

Within indie games are represented a number of popular genres of old that no longer receive exposure in the mainstream. There are still die-hard fans of the point-and-click adventure genre and the shoot ‘em up genre, but there aren’t enough of them to justify big-budget boxed releases outside the oddball title once every year or two. The indie scene has stepped in to support fans of these genres, and developers release a steady stream of these titles all the time.

Counterstrike started life as a Half-life mod

Indie games also invent new genres that often make their way into the mainstream. Popular PC shooter Counterstrike began its life as a freely-distributed game mod for the original Half-life. A loose genre that has gained popularity as of late is the “arthouse game.” This genre label doesn’t really describe a particular set of gameplay conventions as many do but instead refers to an underlying philosophy present throughout games in the genre to a greater or lesser extent. This genre bending and stretching often even stretches the definition of a “game” to encompass interactive works of art (drawing the ire of some).

Speaking of game mods, they too are a major part of the indie gaming community. Modern PC games often ship with sets of tools that allow players to more easily modify and extend the experience of the original release. Even before these toolsets were common, users were still known to hack together modifications of popular games. These mods can be as simple as a new map or weapon or as complex as a completely new game with entirely different sounds, weapons, characters, and levels. Modders have even developed completely different genres of games on top of existing ones.

By nature of their being not as commercially viable as big titles on the console, they are also less visible. So, where would you go if you wanted to find some cool indie games? Try these sites:

Bytejacker- Bytejacker is a twice weekly video podcast that focuses on downloadable games in general. Of course, the WiiWare and Xbox Live Arcade titles profiled are still big—too big in most cases to be classified as “indie,” but the show also covers indie PC games and iPhone games. It is currently one of my favorite podcasts and is certainly a fantastic source for indie goodness.

Indiegames.com Blog- This blog covers the hottest releases in the PC indie scene. You’ll often get video footage along with the descriptions to further entice you.

The Independent Gaming Source- Indie PC games are also the focus of this long-running blog. Subscribe to this feed and you will surely find a plethora of awesome games you would otherwise have overlooked.

Game Tunnel- Accessibility to developers is a double edged sword. In the indie scene, you will find some gems packed full of originality. You’re also going to find a lot of crap. If reviews of PC indie games are what you’re after, this is your place.

Slide To Play- My current favorite iPhone games review site. Sure, the iPhone is starting to get noticed by major developers, but it is still a largely independent playground.

Kongregate- This is the killer platform for Flash games. Kongregate hosts a ton of games and has site-wide acheivements ala Xbox 360. Completing an achievement in a game that supports them (many do) will add to your site-wide score. You can also complete certain acheivements to earn cards for use in Kongregate’s Flash-based collectible card game. The site also enables you to chat with other players while playing. I’m raddevon on the site so, if you join, look me up!

Newgrounds- You might call Newgrounds the birthplace of Castle Crashers since the game’s creators not only got their start posting games on the site; Tom Fulp himself actually started the site! The site is the original home of Alien Hominid which eventually became a modestly successful console game on multiple platforms including the latest version on XBLA. The success of that game paved the way for the insanely fun XBLA title Castle Crashers. The site hosts all types of Flash content, but a major chunk of its content is in the games section.

Mod DB- If you own any of the popular PC games released in the past 10 years, there are probably at least one or two mods you could download and install for free to give you a fresh gaming experience. Mod DB currently indexes almost 5,000 PC game mods which can be searched and sorted by the game they modify, the release status, the genre, the theme, and whether they are single or multi-player.

If you find yourself bored with a seemingly endless cavalcade of cookie-cutter AAA titles, dig a little deeper into the indie games scene. You’ll find greater variety and incredible innovation in almost every aspect of the games from story to visuals to gameplay. There are also indie developers working hard to refine more mainstream gaming tropes to levels not pursued in the mainstream. The indie scene can truly provide something for every gamer.

I created this Yahoo Pipe which asks for the app name and generates an RSS feed that will update whenever the price of the app decreases. I myself could probably have saved $20-30 up to this point if I weren’t so impulsive!

App store price drop tracker

Which apps should you start tracking? Of course, I have a few suggestions (in no particular order). For your convenience, I have already linked the titles to their respective price drop feeds. The feeds will appear empty unless a recent price drop has occurred.

1. Baseball Superstars- Popular baseball game available on several mobile platforms
2. Guitar Rock Tour- Rhythm game akin to Tap Tap Revenge
3. SimCity- Deep city-building simulator
4. Things- Slick task management app
5. PushupFu- Makes doing pushups a game using your iPhone
6. Touchgrind- Fingerboard simulation. Skateboard with your fingers
7. Hero of Sparta- Has been compared to God of War
8. Tweetie- Fantastic Twitter client