For infinite health, use the DOS utility DEBUG. First backup your game to be
edited, then type the following from the DOS prompt:

For the CGA version of this game, type:
ren tmntcga.exe cheater.cht
debug cheater.cht
e db64 90 90
e dbf1 c6 07 80 eb
e 9b5e c6 07 80 90 90
Then type: w
q

For the EGA version of this game, type:

ren tmntega.exe cheater.cht
debug a 100
mov dx,es
add dx,1000
mov es,dx
g 108
r ip 100
ncheater.cht
l
e es:6bd 90 90
e es:74a c6 07 80 eb
e c6b7 c6 07 80 90 90
Then type: w
q

For the [TANDY] version of this game, type:

ren tmnttdy.exe cheater.cht
debug cheater.cht
e d65f 90 90
e d6ec c6 07 80 eb
e 96be c6 07 80 90 90
Then type: w
q

Then rename CHEATER.CHT back to its previous name

Press A,S,D,F,G,H at the same time so you can walk thru buildings.

Press Q,W,E,R,T,Y,U,P at the same time for unlimited energy.

When you eat a pizza, enter and leave the sewer. The pizza will reappear. Cowabunga