Spelunker

You’re the titular Spelunker, spelunking for treasure hidden in haunted caves. It’s a single-screen platformer consisting of six larger levels that scroll left/right and up/down to reveal further areas, all filled with numerous ropes to climb/jump from, platforms, elevators, and more. Deaths come frequently and it’s tough from the moment you start. If you step off the elevator at the beginning incorrectly, you’ll die instantly.