Mission 1: Last Man Standing
You are Garrett, and are turned loose in a Hammer compound with 8-12 other Hammers and Haunts. The objective is simple – kill or be killed! You have 10 lives, and your opponents have between 8 and 12 each (depending on difficulty). Each time anyone dies (either by you or another AI), they lose a life, and when those lives are all gone, that player is out of the game – this includes you, as Garrett! So your only objective is to outlast all the AI, killing as many as you can without losing all your lives in the process.
Mission 2: Deathmatch
You again play Garrett, and this time the first participant to achieve 25 kills is the winner. In order to win, you must achieve the kill goal before any of the AI do.
Additional Comments: You can skip straight to Deathmatch by using the Ctrl-Alt-Shift-End shortcut to end the first mission.