Untangle is a puzzle game. Your goal is to move flies around, until the lines between them don't cross.
UPDATE: After you solve any 5 levels, you get a spray that can be used to destroy flies in higher levels.
FlyTangle is a puzzle game with 21 brain teasers. It's based on planar graphs (field of math). It's very similar as the games Untangle or Planarity.
The lines between flies are crossed. Move the flies with your mouse to uncross the lines in the net. A non-zero score will unlock next level.