Games: Proprietary flash-card approximately the size of a postage stamp.
Using flash memory cartridges and a flash card writer, anyone could create their own Game Boy Advance games and play them on their system.
There were limitations to this model, like the lack of Wi-Fi connectivity and a flash card reader.
A great set can be found at Flash Card Exchange; one can either study the words online, or print them out to carry and study.
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