Super Mario World for iQue GBA featured thorough translation. All in-game text (except credits) are translated into S Chinese, except the "HELP" (and "CLEAR") messages from Princess Peach in the status menu. It's likely that the low res text is hard to display Chinese characters.
Also for some reasons, the iQue GBA version does not display "MARIO START" or "LUIGI START" at the beginning of the level, bu rather uses "GAME START" for both characters. The game does differentiate Mario and Luigi when a level is cleared.

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