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PocketStation is a memory card peripheral for the Playstation 1 that was only released in Japan. Software for the PocketStation was typically distributed as extras for PlayStation games, included in the CD-ROM, enhancing the games with added features. Stand-alone software could also be downloaded through the PlayStation console. The software is then transferred to the PocketStation for use. A built-in infrared data interface allows direct transfer of data such as game saves between PocketStation units, as well as multiplayer gaming. A total of 60 PS1 games were compatible with the PocketStation.