Cheat menu:
Highlight a saved game file at the game selection screen. Press
L, R(2), L, R(2), L, R, L, R to display a cheat menu. Enter one
of the following codes for the corresponding effect: 

Auto-saves
Enter ASAVE to automatically save after each completed level. 
Fifty lives
Enter LIVES. 
Christmas mode
Enter MERRY to hear Christmas music and turn the stars into bells,
and bananas into blue presents during the bonus levels. 
Sound test
Enter MUSIC. 
Alternate colors
Enter COLOR to dress Dixie's in purple and Kiddy's in green. 
Bonus coins
Enter WATER. Dixie will cry to confirm correct code entry. Swim to
the waterfall to the left of Funky's Rentals without any companions.
Approach and touch the waterfall on the left side of the map. Enter
and beat the Banana bird cave behind the waterfall to find 85 bonus
coins. 
Expert difficulty
Enter HARDR to make the game more challenging. 
No halfway barrels
Enter TUFST. 
Erase time records
Enter ERASE. 
Extended music:
Press L, R, A, B, X, Y at the game over screen. 

Lost World Of Krematoa:
Locate the four rocks that are placed in a circle. Jet ski around
the rocks in a counter-clockwise circle until a noise is heard. The
Lost World will appear in the light blue circle in the water between
the rocks.