All Working Zoo Keeper Cheats - DS
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Extra Hidden Difficulty Level
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.
Expert Difficulty
Record the top score in Zoo Keeper, Tokoton 100, Quest and Time Attack modes.