January 2

Today we bring you Bloons, a fairly simple game. Use darts to pop balloons. Pop certain balloons for power-ups. Use those to pop more balloons. Also, you are a monkey.
The game is a puzzle solver, not a tetris-like game and you aim for completion. There is also an unlimited darts mode for playing around in. I have spent hours on this game and still find some of the puzzles challenging.

Link:
http://www.ninjakiwi.com/Games/Bloons-Games/Bloons.html

Rating: 4 - tons of fun, major time waster, but can get frustrating