I just bought gamecube system for my kids. My kids have Japanese Gameboy SP and I can not connect them to Gamecube system. Please tell me can I use japanese Gameboy SP to US made Gamecube system? I also bought Gameboy link and my kids says it does not work on US made gameboy games. Do I have to buy gameboy link from Japan? Can US Gamecube system work on Japanese Gamecube games? Thanks.