MechWarrior 4: vengeance is the fourth game in MechWarrior series. It takes place in BattleTech universe where the pinnacle of all war machines are huge, heavily armed robots called BattleMechs. The player pilots one of these "'Mechs" and uses variety of available weapons (autocannons, lasers, missiles, and more) to battle enemy 'Mechs, tanks and other vehicles. A subsequent stand-alone expansion, MechWarrior 4: Mercenaries, was later released. (mobygames.com)