Clash at Demonhead (電撃ビッグバン, Dengeki Big Bang!) is a video game released by Vic Tokai for the Nintendo Entertainment System on January 27, 1989 in Japan and December 31, 1990 in North America. The cover was illustrated by Lawrence Fletcher.
Clash at Demonhead is an open-ended platformer. The player takes control of Billy "Big Bang" Blitz, who is capable of running, jumping, and shooting. He is initially armed with a handgun, though various upgrades can be purchased from a shop. He later gains the ability to perform various powers by collecting Force, including shrinking, teleportation to previously-visited areas, flight, healing, and invincibility. The player chooses levels from a world map that consists of over forty routes. Various objectives must be met to complete the game
Source: Wikipedia, "Clash at Demonhead", available under the CC-BY-SA License.