To activate the CHR ROM "Smiley Test" easter egg for this game, you will need to power on the NES console while holding Up, Down, Left, Right, B, Select, and Start. Note, however, that it is not normally possible to hold all four D-Pad buttons without specially modified controllers; standard ones will not work.
PRG ROM Smiley Test
To activate the PRG ROM "Smiley Test" easter egg for this game, you will need to power on the NES console while holding Up, Down, Left, Right, A, Select, and Start. Note, however, that it is not normally possible to hold all four D-Pad buttons without specially modified controllers; standard ones will not work.
View Hidden Credits
At the Codemasters logo, press and hold A + B + Select + Start before the title screen appears.