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Picture of Cardboard NES Cartridge Sleeve
DSCF1811[1].JPG
I, personally, have been annoyed when I don't have a sleeve for my NES cartridge's.  So I have made a replica for the original sleeve that usually comes with any new game like Super Mario Bros.

Step 1: Materials/Tools

Picture of Materials/Tools
Here are the materials you will need to make this:
Glue(I used Elmer's.  It dries very fast.)
Cardboard(Make sure it is very thin.)
Pencil/pen
Tape(optional,if you don't want to hold it forever.)

Tools
Scissors
Box Cutter(Helps in the future,trust me)