Hide and Seek can be done already. Froggerooh has even started some games. Use “/dynmap hide”, then find a place to hide, then press sneak button so people can’t see your name. (or don’t, if you want it to go faster.. maybe tease them with 1 second of visibility)
Frogware is sort of a Simon Says game. In fact I plan on adding one task that plays on that concept. It’ll do something like tell you a random color block, action (break, stand on, drop, pickup), and either a negative or positive. (eg. “do” or “don’t”) I’m calling it “PK Says”.
I actually had a game of continuous tag going on for a while, but it never became a thing. An on-demand game might be more enjoyable, but it still needs something more.