"The benefit of the Raspberry Pi is that it's very portable - if someone gives you an SD card with games on it you can come home and play it on your TV, your parents can see it, your friends can see it, " said the team's mentor Luke Staddon from IBM.

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To play games at one of the Internet cafes, a customer gets a prepaid card and then goes to a computer.

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Before previous games, Maddon had a DJ play music in the clubhouse and a magician do card tricks, and he promised a big animal finale on Wednesday night when the homestand ends.

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Customers could buy Internet time on a card and check email on any number of computers, but most would play the slot machine-style games.

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Scrolls would take the "genre of collectible card games to a whole new level" by putting it online, involving auction houses and tournament play, said Mojang.

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