Buzzsaw:
Select the hard or very hard difficulty setting. Win Eliminator,
Deathmatch, and Endurance ranks with the same character.
City Canal level:
Successfully complete the Deathmatch level under the normal difficulty
setting to unlock the City Canal level in multi-player and quick battle
modes.
Downtown level:
Successfully complete the Eliminator levels under the normal difficulty
setting to unlock the Downtown level in multi-player and quick battle modes.
Santa hats:
Set the system date to December 21 through December 25.