All Brazilian Amiga users had this little util called "Pal Booter". and what it did was changing the Amiga display frequency from 50 Hz to 60 Hz (or was the other way around? can't remember now), and then reset the Amiga, so you inserted your game disk and the game would run in the new frequency
Some games needed that, others would only WORK with that, and other won't look fine with it. Some cracktros also had the option to change the frquency.
This may seem like a silly question, but did the Europeans also used this util ?