In Mass Mayhem 2099 A.D., set in 2099 A.D. yet corruption is more present than ever. Government opression has merged with corporate domination. You are a lone rebel ready to take it all down! Are you prepared to create total havoc and mass mayhem? Get ready for futuristic weapons, sophisticated offense tactics and a killer mech! Complete mission objectives, upgrade your weapons and have some bloody fun. How to Play: How to Play:Arrow keys to move and aim. Spacebar to equip and use weapons or 1 to 9. X to interact. J to equip jet pack, up key to use.