Dangerous Dave in the Haunted Mansion (also known as Dangerous Dave 2 and under the Froggman title, Rooms of Doom) is a 1991 sequel of the computer game Dangerous Dave. It was created by John Romero, John Carmack, Adrian Carmack and Tom Hall. It was developed on the Shadow Knights engine with some extra code for smoother character movement. Also an auto-loading shotgun debuts in the game. Many of the features that debuted in this game were carried over to its sequels, Dangerous Dave's Risky Rescue and Dave Goes Nutz! Source: Wikipedia, "Dangerous Dave in the Haunted Mansion", available under the CC-BY-SA License.