two options: get an adapter for Japanese games or swap out the cartridge shells. credits to nicobbq on the latter option. if u compare the two, u will notice that the Japanese cart has the two dents in different positions.
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Yeah but this isn't a Japanese cartridge XD This is American, and I have a PAL system 'cause Brit, where it was never released. I've tried a cheat cartridge for region swapping or whatever which didn't work no matter which way I tried it, and didn't surprise me too much because I understood it wasn't really a legal bit of tech but hey if Nintendo refuses to sell it on a working non-locked platform nowadays and I can't give them money for it....! And I still can't emulate it without some complicated faffing for the mic...!