Simply load the wongs.bas loader program into memory and add any or all of the following pokes to line 10002
POKE &5ECC,0 ' Infinite Lives
POKE &5FA2,0 ' Infinite Spray
Other useful Pokes I found which make the game easier are:
POKE &491F,0 ' Limited Movement or Freezes Monsters
POKE &4954,0 ' Limits Monsters moving up the Ladder
All of these Pokes were found to disable this type of routine:
LD HL,xxx ; Where xxx points to the address of a specific variable