Seems interesting but for some reason on Chrome on my iPhone 13 mini the page is too big for the screen: I have to pinch zoom out to see the X that dismisses the instructions, and can't scroll the about page.
Did you make some assumptions about the minimum window / screen size based on oversized modern smartphones, forgetting that lots of us still cling to more reasonably sized older devices?
Hm, yeah, tested it down to about 500 px width, and the low-resolution devices in Chromium but that was too optimistic then. The modals should of course be closeable, and both game boards simultaneously visible. Played around with the modals a bit, so maybe it works better now?
Did you make some assumptions about the minimum window / screen size based on oversized modern smartphones, forgetting that lots of us still cling to more reasonably sized older devices?