Dungeonland, which is essentially a demo version of the game.
For the uninitiated, Dungeonland is a co-op action-RPG similar to Diablo, but set in an amusement park for "surviving relentless hordes of friendly staff and stealing loot from all of the gift shops." In the free-to-play version, the DM Tower will be available to all players; the DM Tower allows one player to issue commands to the park and bring out the monsters for the other three to fight.
Players can purchase content from the Free Admission Edition, including the "Cannibal Kingdom,” “Arcane Kingdom,” and “Infinite Dungeon” stages, by purchasing the in-game “All-access Pass,” which basically turns the game into a full version.
Current owners of Dungeonland will be upgraded to the All-access pass for free, and all existing gift copies of Dungeonland will include the pass as well.