Have you ever wanted to play your Japanese import Famicom carts on your NTSC-U/PAL NES but found out it was to small? Well if there's a nearby video game store that still carries NES carts, rejoice!
Here's how you can find one. Go to any store that still sells old NES carts (GameStop, etc). Look for old games for example: ExciteBike, Hogan's Alley, Gyromite, or Wrecking Crew.
The cart should feel slightly heavier than a normal NES cart.
Step 1:
Look on the back to see if it has 5 screws. The cart can have 5 screws, but it does not guarrantee that it contains the converter.
Step 2:
On the front label, see if it does not have any grippers.
Step 3:
Look on the inner edge where the slot chip is, facing the front of the cart upwards.
If the whole chip is gold, then you have yourself a cart with a converter! If it has some green close to the inner part, then you have to try another cart.
The game should have this seal:
It should read: THIS SEAL IS YOUR ASSURANCE THAT NINTENDO HAS APPROVED AND GUARANTEED THE QUALITY OF THIS PRODUCT.