In Zone Runner, you must collect all of the coins in the level to move onto the next. There are 3 zones, with the first 2 having 10 levels and the last having 5, for a total of 25 very challenging levels. Between each zone, you will get a password that can be used at the main screen to access the following world.
At first, the game might appear easy. But then you start encountering new obstacles, like mines, springs, lava, fireballs, ice cubes, and moving platforms. The game starts getting pretty hard around the 8th level, but at that point you are so addicted that it doesn't matter.
Zone Runner is a must-have. This is one of those games where it's so addictive that you spent hours trying to get past a hard level. So download it. And be sure to check out the sequel, Zone Runner 2.