If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Probably one of the best reaction games out there. Test your skills by controlling this suicidal maniac – Cube. First few levels might look easy, but don’t despair, you will reconsider that when you will reach further levels, the speed will be overwhelming. Also you will be able to put down your name in the scores and compete with other reaction freaks.