Fully playable too, if you don't mind playing on a thumb-sized screen that is. Four different machines, including back-lit marquees. If you're really cheap though, and not a collector, apparently all four games are actually present on each machine- just ready your soddering iron (or souldering iron if you prefer) and hack away. Here's Techmoan's look at them:
Index 
Threaded 
Keychain arcade machines
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