Protect the Center

This is a 2D physics game which is very easy to play but hard to go far. Your goal is simple: touch the screen to change the shape located in the center of the screen in order to get a "stronger" one before the attacking shape is reaching you. Who is "stronger" is defined in the game rule in "How to Play". Dont think the game is easy, the attacking shapes are coming from the corner of the screen with random speed, but be aware that they will be coming faster and faster with the increase of the game level. The "shape mode" is relatively easier because the rule is easy to remember; the "color mode" gives you a little bit more challenge because the rule for it is harder to remember. Finally, the "Combined mode" in this full version, which combine both "shape mode" and "color mode" in one session, will challenge your memory in a dynamic changing environment and your response speed to changes. Good luck!

key features:
* 2D physics
* Game center leaderboard