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Hyper Debuggers Mode
At the title screen, hold A + B on the second controller then press A + Select or B + Select on the first controller. Here, you can listen to the game's music and sounds, as well as select any game level to start with. Press Select to view CHR data ROM. To start the mini-game, press B.
Here you can view the game's graphics. Press the D-Pad to switch the current data bank, press Select to change palette and press Start to return to debugger menu.
There is an "Option game" available. The goal is to press the A button faster than the opponent. Press A once immediately after the message "!!! HIT A-KEY !!!" to win. If you press it before the message appears, you'll lose the round.