"What in Hell is Bad?" is a mobile game developed by Prettybusy, which is an adult otome game set in a secret club located in hell where the Seven Deadly Sins reside as VIP members. The game is also a defense-type game where you command the characters and place them on tiles to defend against angels. The game was set to launch in April 2023, but the release date was postponed several times. The final release date was confirmed to be October 4th, 2023. The game is available for download on Google Play and the App Store. The game is rated 18+ and contains adult content, so minors are not allowed to play it.