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Any of the following:
Defense Grid, Dear Esther, Capsized, Thomas Was Alone, Atom Zombie Smasher, Primordia, Blades of Time, Post Mortem, Avadon, Tiny and Big in Granpda's Leftovers, English Country Tune, Intrusion 2, Oil Rush
For Organ Trail?
Dungeon Siege [Tradeable]
Puzzle Agent [Key]
Organ Trail: Directors Cut [key]