UCM: The Ultimate Combat Mission (Commodore 64)

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Developer Message#

A message from Richard Aplin can be seen loaded in memory at 15FF when the player is at the game's title screen:

HI THERE! TO GET INFINITE LIVES, TAKE OUT THAT NASTY LITTLE DEC JUST BEFORE THAT JSR BELOW! 
SAY HI TO ME IF YOU SEND THE POKE INTO ZZAP!  CHEERS. GREMLIN

True to its word, directly after this text at 1699 is the following code:

,1699 DE 4D 0F DEC $044D,X
,169C D0 35    BNE $16D3
,169E BD 55 04 LDA $0455,X
,16A1 20 05 17 JSR $1705

Replace the three bytes at 1699-169B with NOPs (EA) to get infinite lives.