A great overhead shootem up in which the player flys a choice of many different futuristic planes/crafts. If you can imagine Raptor with good gfx, amazing weapons, great enemies, and gameplay that is actually FUN and replayable, you understand the full scope of Tyrian. In my opinion it is the best computergame of all time (and yes, I've played Doom and HL and over 160 other games).