It gives you a free move.

Just tap on the booster and it will explain what it does.

Does anyone know what the

You beat the level first and then play it again and it will give you the red stars.

I believe you can now go to Tiki Skies and play those levels.

Connect your game to your Facebook account and it will bring up your friends that play. You then send them a request for "help" in the freecoins section and then you guys can send each other 3000 coins back and forth repeatedly.