This opposite game check your reaction. The game provides 6 levels. Right hand on Arrow Keys only Left hand on WSAD Keys only Right hand on WSAD Keys only Left hand on Arrow Keys only Right hand on Arrow Keys and Left hand on WSAD Keys Right hand on WSAD Keys and Left hand on Arrow Keys After you choose the level, it shows the count-down number 3, 2, 1. Then in the middle of the grey area, an arrow sign will be showed up and then faded.Always press the OPPOSITE DIRECTION key immediately. Every level have 10 choice. Enjoy!