To enable Willy to walk through guardians with impunity:

POKE 36860,0: POKE 36872,0

To enable Willy to survive contact with nasties:

POKE 37488,201

To enable Willy to survive a fall from any height:

POKE 35809,255

To make the game continue without loss of life after all the air has run out of the cavern:

POKE 34798,1

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

POKE 35834,0

To activate the 6031769 cheat mode immediately (without having to type 6031769):

POKE 33885,7

For a list of all the caverns and their teleport codes, see the Caverns page.

To give Willy more than 100 points for collecting an item:

Note that giving Willy 10,000 points or more per item means he won't be able to gain extra lives (normally granted every 10,000 points) by collecting items: Willy gains an extra life only when the thousands digit rolls over from 9 to 0 (see 90EA).

To enable Willy to open the portal by collecting only one item (regardless of how many are in the cavern):

POKE 36749,49

To enable Willy to walk through the portal to the next cavern without collecting all the items first:

POKE 36826,0

To remove the Skylabs from Skylab Landing Bay:

POKE 36478,195

To prevent the light beam in Solar Power Generator from decreasing the air supply:

POKE 36230,24

To start the game with N lives remaining (0<=N<=255; normally N=2):

POKE 34269,N

Note that the routine at 870E 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 drawing of more than one remaining life:

POKE 34607,0

To give Willy infinite lives:

POKE 35136,0