Spelunker on the Commodore 64 is a notoriously tricky side-view platformer where you’re a fragile cave explorer descending ever deeper into a sprawling underground cavern in search of treasure and a final escape. You run, jump, and ride elevators and ropes through vertical shafts packed with hazards—lava pits, deadly steam vents, collapsing platforms, ghostly spirits, and bat-dropping guano—while collecting keys, bombs, and items to unlock new areas and blow up obstacles. The catch is that your spelunker is incredibly delicate: even short falls, mistimed rope grabs, or brushing an enemy mean instant death, and your air supply is constantly ticking down, pushing you to move fast but precisely. The result is a memorization-heavy, precision platformer that’s as famous for its unforgiving difficulty as for its atmospheric, treasure-hunt vibe.