Boot up keys actions - Flash light mode and more?

I found some information about holding down the UP button when turning it on to put it into flash light mode.

I also found holding the A button stops the Arduboy logo, and while held pressing up shines the green LED and down the red LED. Is this just for testing or does it do something to the device?

Any other secrets like this?

See the Start up features section of the README for the Arduboy2 library
https://mlxxxp.github.io/documents/Arduino/libraries/Arduboy2/Doxygen/html/index.html

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Brilliant, thank you. The right key to bypass the logo is good to know!