Shadowrun
Shadowrun
A hidden debug room remained hidden and undiscovered in the game until an interview with the developers surfaced 20 years later in Retro Gamer magazine. Interacting with a matchbox near a flickering street light outside the Morgue in a specific way would warp the player into a room containing various items (including one thought to be unused in the final game) and warps to every level in the game.
Contributed by KidDivinegon