Reverse Hills

Reverse Hills is a dungeon in Shin Megami Tensei IV.

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A building found underground beneath Roppongi Hills, it is a mirror of the building except upside down. A path from Midtown leads to the building. The 7th floor, which is also the entrance, is filled with rooms of men in gas masks in front of people strapped to chairs. The room with only a gas masked man will be the one where the Card Key 2 is acquired to activate the elevator. The 8th floor has rooms with children, with the one with two kids and a gas masked man being the one where Card Key 3 is obtained.

The 9th floor is filled with demon walls, making one have to traverse through the entire room to get to the room where Card Key 4 is at. Unlike the last two the gas masked man will attack with the Deceased Horde.