Place your Tomb Raider: Chronicles Dreamcast disc in to you PC-CDROM. You'll find an abstract message that states "Maybe some cheats will go here".

Do They? I doubt it.

This is to go to the Gallows Tree level. First go to title screen, then press and hold the L and R triggers, then push left on the direction pad. Wait a few seconds and the game will start automatically at the gallows tree with young Lara.