I spotted this Mastermind game made in @geogebra, and it turned out to be a good example to show the difficulties I have due to colour vision deficiency, and how you can design an interface differently to avoid them.
youtube.com/watch?v=gRdrf7…
In reply to @christianp
@geogebra You can play the game at geogebra.org/m/urrmrv2f.
I'm not saying I expect the author, Alexander Huber, to fix this - I think this was just made for fun.
But when you're making stuff like this for work, you really need to consider basic accessibility problems like this.