Collider
© 2014 Freecloud Design, Inc.
This 70 level puzzle game is easy to learn, in part thanks to a good tutorial, and hard to stop playing. Your goal is to cancel out the positive and negative balls, by making them collide. OK, if you want to call them "particles" you can look at this app from an electron/proton point of view. But it's more fun to just call them bouncing balls. Like the Incredible Machine, you first arrange the items on the screen, and then press "play" to turn on gravity. In some levels, you must navigate a maze of pipes. Others involve sensors that activate doors, gears that must be synced... or there are springboards, pendulums and seesaws. It is easy to rewind or fast-forward through the levels, but you must unlock the levels, one at a time. There's enough variety in the puzzle themes to keep things interesting. The concept of seeking equivalency has some nice mathematical roots that anyone who has ever balanced an algebraic equation will recognize. We especially liked the rewind feature, which resets your puzzle just the way you had it. A double tap on the fast-forward speeds the puzzle along, which encourages experimentation. Progress is saved automatically.
$0.99, iPad, iPhone, iPod Touch
Teaches: logic, math, equivalency, timing
CTR Rating: 98%