MakeUseOf (MUO) is one of my favorite sources for knowing cool websites and tips. Recently, it rolled out a new monthly column on games. Every month, they said they'll be featuring some best free iPad games. The first month they featured games in the puzzle category - Arcs Free, Blocks Free, Clockwork Brain, Doodle Fit Lite, Moonlight Mahjong Lite, and my favorite Cut the Rope.
It is important to exercise your brain once in a while and have some fun at the same time. Check out MakeUseOf's free iPad games puzzle 2012 Feb edition.