Free Steam Key: Dungeon Defenders 2 (Closed Alpha)
9/11/20151. Go here & create an Alienware Arena account if you don't already have one
2. Go here & login
3. Click "Get Key"
4. You will receive the key in your e-mail inbox
Bonus:
Warhammer 40,000: Dark Nexus Arena (Closed Alpha Starter Pack)
Free Steam Key: Dirty Bomb - Exclusive Alienware Skin Case DLC