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I know a few of them (discovered accidentally):
- 15 stores simultaneously
- 10 circus simultaneously
- 5 super cassinos simultaneously
- 30 palm trees
- 30 cacti
- plant 10 oaks
- Simple Solutions: Build 15 motels simultaneously
- Bowling fan: Build 15 bowling clubs simultaneously
Don`t know about the rest of the secret ones.
Any one have another clue.