Easy Coins.
To get lots of coins, these are the steps you need to follow:
1. Buy 15 shiny shell stickers.
2. Go to world 4-1.
3. Walk into all the shiny goombas you see.
4. When you are battling them, use the shiny shell stickers. You will get HEAPS of coins this way.
More tricks, tips and cheats for this game are right here - Paper Mario: Sticker Star cheats
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