From the introduction:
True Dungeon is a live, immersive, walk-through role-playing experience. It combines elements of escape rooms, haunted houses, and its rules are very loosely based on the third edition of Dungeons & Dragons. Individual players test their gaming skills in an adventure where they battle monsters, solve puzzles, and overcome mental and physical tests of skill. All of these challenges come together to make the True Dungeon experience unique in the gaming industry. Playing True Dungeon is all about teamwork and you the individual against the game rather than player vs. player. True Dungeon is not a Live Action Role Playing (LARP) game, because it does not require players to assume a persona or act in character. The focus is not on how well a person can stay in character. That said, players are welcome to get into a character as much or as little as they want.
There are 12 character classes available to play: barbarian, bard, cleric, druid, dwarf fighter, elf wizard, fighter, monk, paladin, ranger, rogue, and wizard. The character classes have been crafted to allow each player to have some unique ability that by itself may not seem special, but as part of a team allow each player to contribute to the success of the group. Primarily, True Dungeon is about you, your actual real-world self, testing your wits in a gaming environment. It is you finding the traps, you solving the puzzles, and you “fighting” monsters in mortal combat.