First addicting game.

Waaay before the C64 or ZX spectrum: the classic text-based Adventure, played on a S100-bus computer with 8" floppy disks holding a whopping 128KB of data (256K for double density)
I remember those bloody dwarves popping up in the maze of twisty little passages, all the same,


Of course you young whippersnappers were spoilt with games with graphics.
We had to use our imagination

 

Pirates on the C64
Bubble bobble on C64