They are made for the Nintendo 3DS handheld system.
Dungeons are procedurally generated, so their layout, items, and treasures change each time you enter, creating a different run on every playthrough.
Replayability comes from procedurally generated dungeons that change each run. The listings also note downloadable content is available for purchase to add additional dungeons.
They are rated E (Everyone). Content descriptors list suitability for all users, and one summary notes mild cartoon violence.
They are listed as Adventure games, and they do not require batteries.