
Collision Effect's core puzzle mode isn't really worth putting time into, but it's one of the more interesting action-puzzlers on the App Store, and is easily worth the price tag.

Brutal Gamer's Zeth writes:
Chilligo are making huge waves in the mobile market place of late. Consistently pushing out solid, if not always spectacular (apart from Cut the Rope – OMFG!), titles for the millions of iPhone/Pad/Pod users out there.
This time they serve up a slice of puzzling action with a hint of the match-3 mechanics about it.

Games can always surprise you, but in the age of the smartphone there are three rules that, if broken at the start of a game, indicate that what follows is likely to be a total stinker.
For one, it's best to keep the controls simple, but diluting the challenge in pursuit of simplicity is a big no-no. Most importantly, you have to avoid overloading the game with a needlessly fussy set of rules

GameZebo - Awesome original gameplay concept. Cool items in Action Mode, and 60 puzzles in Puzzle Mode. Great unlocking system in Puzzle Mode. Addictive gameplay. Cool sci-fi design. Achievements and online leaderboards.