To make any combination work on the code entry screen:

POKE 34483,195

Alternatively, to bypass the code entry screen altogether:

POKE 33797,135: POKE 33800,202

To start the game in room N (normally 0x21: The Bathroom):

POKE 34795,N

For a list of all the rooms and their numbers, see the Rooms page.

The default start location, (13,20), may not be suitable, depending on the room chosen; to change Willy's start location to (y,x):

For example, to start at (6,28) in room 0x19 (Cold Store):

To enable Willy to walk through (or rather, behind) guardians with impunity:

POKE 37392,0

To enable Willy to survive contact with nasties:

POKE 38447,201

To enable Willy to survive contact with arrows:

POKE 37505,24

To enable Willy to survive a fall from any height:

POKE 36578,16

To enable Willy to walk freely in any direction on conveyors:

POKE 36601,0

To get rid of Maria entirely, leaving the bedroom free to enter without collecting any items:

POKE 38207,24

Or if that makes things a little too easy, try the following POKE that gets rid of Maria after N items have been collected:

POKE 41983,256-N (1<=N<=83)

Exactly which N items need to be collected is determined by the item table at A400. When N=1, the only item that needs to be collected is the one in The Bathroom.

To activate the WRITETYPER cheat mode immediately (without having to type WRITETYPER in First Landing):

POKE 34275,10

For a list of all the rooms and their teleport codes, see the Rooms page.

To start the game with N lives remaining (0<=N<=255; normally N=7):

POKE 34785,N

Note that the routine at 898B tries to draw all remaining lives at the bottom of the screen, which means that for large N, there is screen corruption and the game slows down considerably; to avoid this, disable the routine:

POKE 35211,201

To give Willy infinite lives:

POKE 35899,0

To stop the clock and give Willy infinite time to complete his task:

POKE 35408,24

When it became clear that the Attic bug was actually a bug and not a feature, Software Projects published some POKEs to fix it and some other problems with the game:

The first POKE (60231,0) removes a nasty from Conservatory Roof, which makes it possible to collect the otherwise uncollectable item on the far right:

Before	After POKE 60231,0

The second POKE (A4C7,11) moves the unreachable invisible item at (3,26) in First Landing to the same coordinates in The Hall (where it is still invisible, but now reachable).

The third POKE (59901,82) fixes the misplaced arrow in The Attic by setting its pixel y-coordinate to 41.

The fourth POKE (56876,4) replaces a wall block with a floor block in The Banyan Tree, which makes it possible to access the room above (A bit of tree) from the right-hand side (which in turn makes it possible to reach the otherwise inaccessible items in Conservatory Roof via the ledge on the lower left in Under the Roof):

Before	After POKE 56876,4