Hello, I made “Arduboy Writer” by Raspberry Pi Zero.
I want to change another game without PC. So I made it.
You can write any hex file by this Arduboy Writer.
There’s a small typo in the first diagram on your blog.
‘battery’ is misspelt as ‘batrery’
Luckily the diagrams are fairly self-explanatory so you don’t need to know Japanese to understand it.
(Though I could read bits of it - I’m not sure what “Switch Science” (スイッチサイエンス) is, but I’m guessing “Tact Switch” (タクトスイッチ) just means a tactile button/switch.)