Tremor Games is a site where you can earn/win games by completing achievements in flash games and completing offers. You earn coins and then use them to buy games at the Tremor Shop.
Here are some free Painkiller keys! Have fun!
G5DRK-3V8CX-E38RT
G52RG-F0784-6NK8G
G5800-8WQ0W-NX286...