In the Solo/Co-op menu, hold the Left and Right Triggers , then press X five times and Y five times.
In the original trilogy, "Level Cheats" typically refer to hidden codes that allow you to skip missions or unlock every level from the start. These methods vary significantly depending on whether you are playing on a console (Xbox, PS2, GameCube) or PC. Quick Unlock Codes (Consoles) Splinter Cell Level Cheat
At the main menu, hold L1+L2+R1+R2 and press Square five times, then Circle five times. GameCube (Original & Chaos Theory): In the Solo/Co-op menu, hold the Left and