Sometimes words just aren't necessary - the picture of the Mario Brothers USB mouse (or mice) is probably enough to convince any retro gamer to dig deep.
Actually, you'll need to decide which one you want, either the pixelated Mario or golden star. Both require USB connectivity and offer pretty basic two-button mouse technology. But who cares, it looks the part - and that's probably enough.
Compatible With Windows, Mac and Linux, it's plug and play with a retail price of $24.99 (around £13).
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From: Final Fantasy XIII 's Motomu Toriyama and Yoshinori Kitase - Interview