Baal

Released in 1989 for DOS, Baal is what happens when demons invade and the only thing standing between Earth and eternal damnation is a guy with a really big gun and absolutely no concern for platforming physics. You’re dropped into a hellish maze of traps, puzzles, and pixelated horror, tasked with recovering the parts of a weapon so powerful it could vaporize a planet — or at least give Baal a nasty sunburn. Think Doom before Doom, but with less speed and more inexplicable deaths from falling two inches. It’s hard, it's moody, and it absolutely hates you.