On the right side on the front of the cartridge is an indentation, it is very unnoticeable at first but with the use of the light or running your finger over it you can usually spot it.

Smaller more fine detials include things like dents on the inner chip as well as what you should see when you turn a translucent chip upside down.

In Pokémon games the cartilage sticker may not be holographic if it is supposed to be holograpic.

The nintendo seal of approval may be missing or may be 'blurry', meaning it was most likely printed on.

It is very common for the text on the cartilage itself to be indented in more if it is a bootleg.

On the inside of the chip the word 'nintendo' was a circle around it should be printed as well as a series of numbers matching the game type and sometimes a year as well.Be aware that this rarely happens if it is a DS cartaigde. Most of the time if you crack open the cartaigde of the game, It will have black putty (or something like that).If you are purchasing your game on online sites such as eBay, it's probably a good idea to not buy from sellers located in Hong Kong or China.Bootleg carts will sometimes misspell Nintendo.

Bootleg carts model number will be in the wrong font.

Bootleg carts will not have the Pat.Pend or Made in Japan text imprinted.

Legit GBA carts grips fade into the plastic casing.

The cart will be a wrong color plastic.

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