Rule or Exception?
A spelling rule is stated — silent E makes the vowel say its name, C sounds like S before E, I or Y, a double consonant keeps the vowel short — and one English word is put beside it. Two buttons, and the only question is whether that word follows the rule, or breaks it.
Ten words per game from a pool of forty, running from the obvious to the genuinely arguable, with an explanation after each. It is the quickest demonstration of how thin most English spelling rules are once you start testing them against real vocabulary — the transparency writeup is the long version of the same point.