If you own an NTSC C64, you know already that the games released in Europe were designed to work on the old continent TV standard, PAL which would prevent the game to run in the machines produced in North America.
If you are brave enough and really willing to enjoy the European games, you can convert your machine to PAL. According to the blog biosrhythm, the conversion is simple, requiring the replacement of the 8565 VIC-II and one crystal.
To read the article, which has many pictures to illustrate the work, just follow the link below.
Link: biosrhythm