World Hero (NES)

Self-Test
Press and hold B + Select + Start, then press Reset. After a while, the self-test screen will appear. Continue holding the buttons to see this screen. It will shows the results of the PRG/CHR CRC tests, the mirroring modes test and the IRQ test. When you release the buttons, the game will continue it's normal operation.

Unused Title
The Game Genie code change the English part of the title screen from "WORLD HERO" to "KUNG FU LEGEND," otherwise unused ingame. Probably this title was intended to be used for a different region, but there is no code to select it ingame.