TimeSplitters 2 Cheats

Unlock story mode characters
Complete the level on medium difficulty to unlock the bonus character.

Return to Planet X - Ozor Mox
Wild West - The Colonel
NeoTokyo - Sadako
Aztec Ruins - Stone Golem
Atom Smasher - Khallos
Space Station - Reaper Splitter
Siberia - Hybrid Mutant
Chicago - Big Tony
Notre Dame - Jacque de la Morte
Robot Factory - Machinist

Handyman level
Only way to get gold is to keep getting to the downstairs part off the main double stairway and get the Tommy Gun X2. Sit in crouch with Tommy guns aimed at head level. If you get shot, there is a health off to your right.

Hit me baby One Morgue Time
Fairly tough level. Don't need to kill all the bad guys. Also, if you breeze through the level quickly, you face fewer bad guys.

Kitten Celeste assault level
Go out, grab the Soviet machine gun, go past the 2 autoguns and grenade the one facing you. Then go behind the crates and nail the first 2 guns you passed fromt he side, safe from the guns (not the bad guys). Go out the door - there's another assault gun - get behind it. Grenade the one around the corner. Shoot the gun you avoided from behind. Go around the corner, genade the gun on the ground, get the armor. Get behind the ceiling guns and waste them. Go upstairs and turn off the switch - you don't need to destroy anything or kill anyone. Make sure you have a Soviet gun with grenades. Go to the hangar, grenade the autogun near the jet and then the two barrels, then run and grenade the other barrel near the other jet. Again, you don't need to kill anyone in the hangar. Reach your objective! Should get you gold.

Brick level challenge (the one in Siberia) with the grenades
Run up the stairs towards the building with the radar. As you approach, grenade the lower level. go around the right side and grenade the windows near the stairs. Up stairs, grenade the door window. Drop down, and grenade the door window. Head to the left and grenade the door window of the little building, then go around to your right to the last building. You may need 2 grenades to break the windows in the last building. Should get you gold.