check out how i did it . enjoy!!
Step 1: The thing ur goin 2 need
3.A sheet rock knife
4.Tiny flat head screw driver
5. Black tape
Step 2: Open GBA n Cut
2. when opened use the knife to cut about a inch in the middle of the game(as seen in picture)
Step 3: Open flash drive
Step 4: Now to put it together
2. place black tape on the flash drive so it and stay in place. if u want u can use something else like hot glue or something else so it can stay but i used tape.
Step 5: Now to add a finishing touch
2. if ur flash drive has a LED light on it make the game look a bit cooler.
3. in the middle of the game insert where u think the light may be at and make a nice small hole i use a screw driver 2 make the hole.