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|This page is rather stubbly and could use some expansion.|
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All NES games from Codemasters are based on the same stub library. As a result, all of these games, including those on multicarts, include a "smiley test" that verifies the integrity of the PRG ROM and CHR RAM chips.
To activate the PRG ROM test, hold Up + Down + Left + Right + A + Select + Start and press Reset. To activate the CHR RAM test, hold Up + Down + Left + Right + B + Select + Start and press Reset. If the PRG ROM checksum matches with the internal value or the CHR RAM chip has no bad cells, the program will display a happy green face; otherwise, it will display a sad red face.
Note that the tests cannot be performed with an unmodified controller, as the design of the directional pad prevents more than two directions from being pressed at once.