Eastwood is a fighting game using only one button for Gamma IV. Either player is controlled with either 'A' on a controller, or Spacebar/rcontrol. Blocking is handled by pressing your button at the beginning of being hit. Dash away/towards your opponent by holding the button for a bit. Mash to let loose a volley of blows, and simply press and release for a single strike. Strong kicks and gunfire can be performed by leaving the controls alone.

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