Zoo Keeper Cheat Codes

Gekimuzu Difficulty
To obtain a 4th difficulty, you need to get the highscore on all 4 modes of gameplay.

Zoo keeper: 1200000+ points needed.

Tokoton 100: 1800000+ points needed.

Quest mode: 10000+ Yen needed.

Time attack: 600000+ points needed.

After getting all 4 high scores, a 4th difficulty appears in the top line of the option menu.

This difficulty means "Expert" or literally "difficult-player" and has a huge advantage of doubling all the normal points you achieve. This secret was found by mtpfreak and verified by bemani.

Expert difficulty
Record the top score in Zoo Keeper, Tokoton 100, Quest and Time Attack modes.