- Got all the Stamps in Aqua Grabber? Then play for DOUBLE the coins!
- Puffle roundup can get you some coins if you have some time...
- As my friend Icequix said, if you get ALL the O-berrys in ALL the parts in the game, (for members only...) He got around 18,000 coins! (with all stamps)
UPDATE: For the third tip, you need to get all O-berrys in the timed part too.
As always,
Waddle on!