Crush the Castle is a physics and gravity based series of flash games developed by Armor Games - using the stone thrower (heavy catapult) to destroy the castles, which will make you think of the Angry Birds series (but with completely different style).

SHIFT is a series of puzzle flash games with exquisite design (using the concept of reversing black and white worlds). They just seem very simple, but for most of stages to clear, you have to shake your brain and need to cooperate with reasonable key controls to get through all the maze.