Dave Goes Nutz!

Dave Goes Nutz! (known informally as Dangerous Dave 4) is a platform game developed by Gamer's Edge and published by Softdisk in 1993 for DOS computers. It is the sequel to Dangerous Dave's Risky Rescue, and shares similar gameplay features. Dave Goes Nutz continues from Dangerous Dave's Risky Rescue, where Dangerous Dave is on a mission to save his little brother Delbert, from the evil "Dr. Nemesis" (who is also the main antagonist in Softdisk's Catacomb franchise). The game takes place within a mental hospital filled with zombies. Source: Wikipedia, "Dave Goes Nutz!", available under the CC-BY-SA License.