Well, I just found out the hard way that my Japanese wii remote will not work with my US system. Why this is, I have no idea. Well, I know that it is because of differences in the wireless receiver bar, but I have no idea WHY they (Nintendo) would DO this! I can't imagine that wireless standards between the two countries could be all that different. I must also say, that my GC memory card and Wavebird (both Japanese, being played on a US Wii) work flawlessly. I am sick and tired with having to guess what will work with what... there is no rhyme or reason to what Nintendo is doing. They need to get their act together!