The ZX81 version is reduced in size (36 rooms as opposed to 64). It needs to be initialised with the object locations at the start of each game. Type the following numbers, pressing ENTER after each: 30 24 21 32 5 8 16 26 2 13 14 36 18 11 35 3 27 6

If the game is broken into, it must be restarted with GOTO 10 rather than RUN.