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Impossible Mission
As far as I could tell, that game really was impossible.
Not at all. It was very easy once you understood it. My favorite part was solving the card puzzles. Once you got the idea in your head of how they worked and what the basic "cut" shapes were, it was pretty straightforward.
The trick was that it didn't do you any good to start solving the puzzles until you'd collected all the puzzle pieces. So essentially, it was a question of cleaning out every room first, THEN solving the puzzles.
That was one of my favorite games of all time. I bought it retail, but still wanted to crack the disk copy protection so I could make backups of it. Cracking that game was the first time I'd seen self-modifying code in 6502 assembler. There was a bunch of perfectly good-looking code that suddenly, mid-routine, turned to random garbage. When I looked at what the code was doing and saw that it was XORing itself into normal code, I was blown away.
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