Tomb Raider Chronicles cheats and cheat codes for Dreamcast

Unlock "Special Features" option at the main menu:
Highlight  "Timex-TMX" at the inventory screen, after 
hold Y until "Secrets" reads "36/36". 

Start at Rome - Story #1:
Highlight the "New Game" option at the main menu,
after hold L + R and push Up.
Note: Keep held the buttons and wait until the stage loads

Start at Russian Base - Story #2:
Highlight the "New Game" option at the main menu,
after hold L + R and push Down 
Note: Keep held the buttons and wait until the stage loads

Start at Black Isle - Story #3:
Highlight the "New Game" option at the main menu,
then hold L + R and push Left
Note: Keep held the buttons and wait until the stage loads

Start at Tower Block - Story #4:
Highlight the "New Game" option at the main menu,
then hold L + R and push Right
Note: Keep held the buttons and wait until the stage loads