Instructables
There are many games worth getting for the Super Famicom (Japanese version of the Super Nintendo) that were just never released in America, and games you may find cheaper for the Super Famicom than for the US Carts. There is region lockout on the Super Nintendo though, making it impossible to play the Super Famicom carts on your Super Nintendo without some kind of bypass.

On Super Nintendo games, there are two notches cut out on the backside of every game. They fit around two pegs that are inside the slot where you insert the cart into your system. Super Famicom carts do not have these holes on them, and this is the only thing keeping you from playing Japanese games. Modifying your Super Nintendo is actually quite simple and very cheap (or free if you already have everything). You can still play your US carts just fine, so there is no downside to this. There are a few ways to play Japanese games, but this instructable will guide you through modifying the actual console itself by removing those two pegs.

Note : Whenever you work with anything, there's a chance you may break it. Be careful.
 
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Step 1: Tools Needed

Required:
Flat, clean work surface
4.5mm Security Bit + Screwdriver handle
Small Philips Screwdriver
Xacto Knife with sharp blade
Pliers
Small metal file or low grade sandpaper

Optional:
Small lid or container (to put screws into)
Push pin or Needle
Q-Tips and Water
Canned Air

The only thing you probably do not already have access to is the Nintendo Security Bit for their special screws. You can easily find it on EBay (paired with it's 3.8mm counterpart for opening up the carts) between $5-10. If you need it, click HERE and order yourself up some.

I've read and tried some other methods for removing the security screws but I couldn't get them to work myself. Do a quick google search for alternate methods if you don't feel like paying for the bit.
corn6748 months ago
I did mine last week. But my problem is i cant just put it in and play i have to fiddle with the card for about 10mins cant go down all the way