Saw this at my local Gamestop. This might not be going on at all GS stores. I was told it's a beta promotion going on in select GS B&M areas.
Basically you get a card at GS and register the code at powerupbonus.com.
Each time you complete one of the 4 missions, you get a reward. If you complete all 4 missions by Nov. 18, you get a $65 rewards coupon.
The missions are:
1. Trade in 4 games valued $10, must have $2.99+ base TIV each (get $10 off one preowned game coupon)
2. Buy 3 preowned games valued $14.99 total, must be $4.99+ each (get $10 off one preowned game coupon)
3. Buy $40 in collectibles, can be completed in multiple transactions (get $10 off one preowned game coupon)
4. Redeem points in the rewards center (get 5,000 rewards points)
A $65 Rewards Cash coupon will be delivered to your PowerUp Account Active Offers within 48-72 hours after all 4 missions have been completed.