EXIT is a puzzle game that requires pure logic rather than luck or dexterity.
It now includes 100 levels (60 campaign + 10 extra in survival + 20 in SEASON1 update + 10 EXTRA levels) that will blow your mind.
The goal is seemingly simple: put all the balls into their corresponding target slots.
While this sounds easy the game isn't so much. One has to invest time into the game master it.