Baby Boom: unlimited

Unlimited mode is an Earlier or Later run. You are shown one known name with its real peak year and one hidden name, and you call whether the hidden name peaked earlier or later. A right call swaps the hidden name into the known slot and keeps your run going; a wrong call ends it, and Play again starts a fresh run. Unlimited mode skips names scheduled for recent and upcoming daily puzzles, so practicing never spoils a daily answer.