Type 'DESTRUCT' at the Tyrian 2000 main menu to access the Destruct mini-game.

There are five modes to play:

Outgunned (green troops outnumbered by opponent's units)
Traditional (one on one battle)
Heli Assault (4 helicopters vs 8 ground units)
5-Card War (5 units vs 5 units)
Heli Defense (8 ground units vs 4 helicopters)