What's in your wallet?
Driver's licence; Visa debit card; donor card; couple of receipts, right?
Well, thanks to a new Kickstarter project, you could soon have a retro-looking miniature games console in there, too.
Arduboy is the brainchild of Oregon-based entrepreneur Kevin Bates. Originally conceived as a business card you could play Tetris on, Bates' console has evolved further.
The device now comes pre-installed with one classic 8-bit game, and has access to an online library of 20 more that you can download for free.
As well as playing games, Arduboy can act as a digital business card, a retro 8-bit synthesiser and a mouse/controller when connected to any USB device. It will also teach you how to code, giving it some serious educational credentials.
The project has already exceeded its funding target of $25,000 (at the time of writing, it's about to pass $90,000), so the fact that you can play lots of much better games on your mobile phone doesn't seem to have put anybody off.