Press Left, Right, Up, Down(2),Up, Right, Left at the "Start/Options"screen. A cheat menu with various options will appear.
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Hold 1 + 2 then press Up, Down.
Hold 1 + 2 then press Up, Down.
Keep attacking your enemy and killing him. There shouldbe a light change in the background. This is rare, but worthseeing.
If you kill your opponent within then seconds a "QuickKill" message will appear. Your enemy will remain dead onthe ground. Note: This only works on the first round.