to operate the game, first press the back button in the game, otherwise you will be able to write up numbers in the 100's, rather than the 10's.
the way the game reads input is very simple and annoying, but its all i got!
to start typing, if you want 3 in the first slot, press 0 then 3. if youve just started the application, press the back button first.
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Source- dsgamemaker