I said in my post with Star Wars Takeover cheats that you can duel penguins for coins. So I am posting how to do it. First you need to get a lightsaber. It is free, but to get it you have to click on a icon that looks like this:
After you get your lightsaber, then you dance to show other penguins that you want to duel. Or you can join a duel by clicking on the icon that looks like this:
Then you pick one of the arrows next to lightsaber.
Its a lot like Card Jitsu and the more you win the more items you get.