I think back to the days of my old 8-bit NES console and when games came on cartridges. There were definitely advantages of the medium, in that you never had to worry about scratched discs, and they loaded instantly. On the other hand, the contacts got all dirty and dusty and you either had to blow on them or clean them with an eraser to get them to work sometimes. You won’t have to worry about that with these cartridges, though.
That’s because all of the data that’s written to Cart Notes is displayed right on the outside, in plain sight. They look just like the old NES carts, but are actually sticky notes.
Fangamer sells Cart Notes in three-packs for $8(USD), which include orange, green and blue accent colors, and 50 notes per-pack, for a total of 150 sheets of paper. I’m pretty sure that wouldn’t be enough space to write down all of the source code from Duck Hunt, but it is plenty good enough for writing down grocery lists and other reminders.