Needs a one-line description on the game page - "move the focus with cursor, or drag, to change the focussed number - make all numbers equal to complete the board" (that's my 30s attempt at an understandable description). I jumped in an missed the rules and then wasn't exactly sure of the mechanism/aim and there were no rules on the page and I couldn't get back to the splash screen without removing the cookie (the setting of which technically breaches EU law - https://ico.org.uk/for-organisations/guide-to-pecr/cookies/ is about the UK rendering of the "Cookie law").