What does the region code on my Nintendo Wii game mean?

"The region codes indicate for which model game computer your game is suited. For example a PAL game can only be played on a PAL game computer. The following region codes exist: PAL (Europe & Oceania), NTSC-U (North America, South America, Singapore, Malaysia and the Philippines), NTSC-J (Japan, Hong Kong & Taiwan) and NTSC-K (South Korea)."

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