Shaky Summit is an obstacle course style game for the iPhone that is actually very enjoyable. You get to pick between one of four characters (the fourth one becomes unlocked as you play through the game) in a head to head race to the top of the summit. You'll have to avoid and cause obstacles to make your way to the top before your opponent does.

The graphics in this game are pretty sharp and don't seem to lag at all during play. Considering it's a time based game, any lag would really throw off the entire feel. What you do in this game is avoid all of the obstacles on your course while trying to make it all the way to the top of the summit before your opponent does. It's not as easy as simply running as fast as you can, however.

There are two elements that make this game more interesting: stamina boost and earthquake. Basically, as you're running along, you'll see timers all over the screen. These timers show how long an earthquake has to go for to move that obstacle. If the obstacle is on your oponnents side, then tap and hold on their screen until it messes them up. Be warned, it may mess you up too. You can also use the stamina boost to jet past obstacles that may just fall on you.

You don't control your character in this game, just the environment. Honestly, that can be tricky enough for you to worry about. The game gets more intense as you go through each level and make it closer to the top of the mountain, but the game play is still the same the entire time. It's a very well built and enjoyable but it won't take you long to finish.