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Nintendo 64 - Zoo Keeper cheats

Unlockable Expert difficulty level: Gekimuzu
Reach the highest score on all 4 modes of gameplay.

Quest mode: 10000+ Yen needed.
Time attack: 600000+ points needed.
Tokoton 100: 1800000+ points needed.
Zoo keeper: 1200000+ points needed.

Illusion bonus - 1500000 points: 
1.) Get 3 blinking tiles on the screen, 
2.) Connect all 3 in a row, horizontal or vertical. 
3.) The screen will flash with a spark bursting out and the word 
"ILLUSION - 1500000" on the screen.