Undernauts: Labyrinth of Yomi

Escape from “Yomi” – a dungeon filled with riches – and danger. You have been recruited into the Undernauts – a team of brave subterranean adventurers who comb the depths of a massive, monster-infested labyrinth in search of priceless resources. Make use of your powerful skills and magic items to create exits and reach the surface alive. As a Dungeon RPG, the player must dive through many dungeon levels and move through a grid system to find the correct path to proceed. Players create a party of 6 in order to fight battles and level up while proceeding through the game's storyline.
Use the "Switch Boost" system to defeat hordes of monsters and create magical doors, ladders, and bridges to escape.
Make use of powerful skills and magic items to reach the surface alive.
The developers describe the content like this: This is a dungeon RPG with blood effects and graphic scenes with blood and gore. There are also some monsters that show partial nudity.