Well Japanese and American carts are actually the same. The case are just slightly different. The use the tab system.
See left a American cart and right a Japanese!There the same.
There are 3 ways to do this. 1st you can cut the game. Second you could swicth the case's. Or third and best you could cut the tabs off the n64.
Needle nose pliers or a dremel tool and about 5 minutes.
Hold open the flap of your n64 and look for the tabs.Then pull or dremel them away and you done!
Image on right is n64 left is just slot and flap.
Congratulations you have a region free n64!
(WARNING any damage done to n64 is not my fault)Also not all pics are mine.)

See left a American cart and right a Japanese!There the same.
There are 3 ways to do this. 1st you can cut the game. Second you could swicth the case's. Or third and best you could cut the tabs off the n64.
Needle nose pliers or a dremel tool and about 5 minutes.


Hold open the flap of your n64 and look for the tabs.Then pull or dremel them away and you done!


Image on right is n64 left is just slot and flap.
Congratulations you have a region free n64!
(WARNING any damage done to n64 is not my fault)Also not all pics are mine.)