The Black Dungeon RPG, also known as Mari and the Black Tower, is a retro-style dungeon crawling RPG game developed by Joshua Keith. The game offers an engaging turn-based combat system with instant abilities and a TP system. It is available for free on Android devices and falls under the category of Role Playing games.

The game features four party members with eight unique heroes to choose from. Players can explore a ten-floor dungeon tower with 30 quests to complete and hundreds of items, weapons, and armors to collect. The game offers three difficulty modes to choose from, making it suitable for both casual players and RPG veterans.

The game is entirely offline, with no ads or in-app purchases. The game's story revolves around Forest nymph Mari and her partner, a young amnesiac named Abbie, who must gather a team of heroes to scale the tower and uncover its secrets before it destroys all life on earth.

The Black Dungeon RPG is part of the Knights of Ambrose Saga, which includes Knight Bewitched, Knight of Heaven: Finding Light, and Knight Eternal (coming soon!). It is only available in English and requires modern mid-to-high-end devices with over 2GB RAM and CPUs over 1.8GHz.