Extended ending
Successfully complete the game and wait for the credits
to end. An extended sequence featuring the game's true ending
will begin.
Glitch: Fall through floor
Play the rooftop level just before the intermission
of Max blowing up the satellite tower under the normal difficulty
setting. At the start of the level, run and collect the items
in the wall. Do not sneak up on the first man; he must turn and
see you. Walk behind him when he stops. Wait until he turns around,
then press [Y] to flip him. This will cause you to fall underneath
the floor and bypass all the guards. Run to the end of the level
where the final locked gate is located. Run into it to complete
the level without running out of time or being seen by the guards.