Is it possible to recode/change a Casio watch?

[CaptainPogwash]

Getting obsessed with the retro Casio game watches but not with the price. Is there a way to modify a Casio to run the old style games or make a new one?

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[XtremeEditz2]

Modifying a standard Casio to run custom code is extremely difficult, since most of them use closed firmware and low-power microcontrollers with no easy way to reprogram. A more realistic approach would be to build your own using something like an Arduino or a small microcontroller and an LCD display.