Steam games:
These are the games you can choose from:

Dead Island Epidemic Beta
Unturned Permanent Gold Account
Guacamelle! Super Turbo Championship Edition
Bastion
World of Goo
Antichamber
Ys Origin
The Blackwell Legacy
Lethal League
Street Fighter

Humbe Bundle on Steam
Command & Conquer: Red Alert 3 - Uprising Steam
Garry's Mod
Orcs Must Die! GOTY
Sanctum collection

Humble Bundle on Origin
Peggle Deluxe, Bejeweled 3, Bookworm Deluxe, Escape Rosecliff Island, and Feeding Frenzy 2 Deluxe
Populous
Plants vs Zombies GOTY Edition, Peggle Nights, and Zuma's Revenge(

Humble Bundle Games
Anomaly 2
MX vs ATV Reflex
Mortal Kombat Arcade Kollection
Defender's Quest: Valley of the Forgotten

Steam games (Higher Level):
L.A. Noire: The Complete Edition (1 game, 1 DLC)