27 keys for Skyrim.

Torchlight 2 - 10 keys or 30 ref
Deus Ex HR - 5 keys or 15 ref
Killing Floor Gift (includes Killing Floor and Defence Alliance 2) - 4 keys or 12 ref
Starvoid - 1 key or 3 ref
Payday - 4 keys + 2 ref or 14 ref
Two Worlds II: Velvet Edition - 4 keys or 12 ref
Dead Space 2 - 5 keys or 15 ref
Left 4 Dead GOTY - 4 keys + 2 ref or 14 ref
Dungeon Defenders - 4 keys or 12 ref
Tomb Raider: Anniversary - 4 keys or 12 ref
Nexuiz - 2 keys or 6 ref

(( if you want, add me here: http://steamcommunity.com/id/petrdzinda/ ))