1552 Tenka Tairan/Hidden content

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1552 sound chekcer [sic]

Hold ↑+Ⅰ+Ⅱ while pressing  RUN  at the BIOS screen.

Force System Card error screen

While 1552 Tenka Tairan's System Card error screen normally appears if the wrong System Card is being used, it can be forced to appear even with a Super System Card inserted by holding →+Ⅰ+Ⅱ while booting the game at the BIOS screen.

Additionally, pressing Ⅰ or Ⅱ 80 times on the error screen will make a speech balloon appear saying there is no trick. Pressing Ⅰ or Ⅱ another 80 times will make it disappear.