S.U.A.V.E.

Don't let the tongue-in-cheek humor of the title fool you -- SUAVE has seriously fast and intense gameplay. In this game, you pilot a lone tank assaulting an enemy base, armed with a modular weapon system and a device that can affect the flow of time. The free Shareware version comes with an extensive map to explore. The full version includes many more maps, an Endurance mode that generates progressively difficult rooms, and an editor that lets you make your own maps.