A playable demo is now available for Dungeon Defenders, offering the chance to sample the newly released commercial version of this action/RPG/tower-defense game that was originally a freeware UDK game. Word is:  "Dungeon Defenders brings together the best elements of tower defense and action-RPG progression in a fully 3D environment; spreading the four-player co-op mayhem out across 15 unique maps – 30 challenges, four difficulty settings – in all its loot-raiding, spell-casting, level-up stacking glory." The demo is available on AtomicGamer, Gamer's Hell, and Worthplaying.