There are 106 games documented on PixelatedArcade supporting Unexpanded for Commodore VIC-20.
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Unexpanded is part of the category VIC-20 Memory Expansion Required.
The Commodore VIC-20 included 5 KB of RAM built in and it was possible to increase the amount of RAM through the use of memory expansion cartridges. Games with the Unexpanded attribute could be run on a stock VIC-20 which did not have any memory expansions installed.