Simon says

American  

noun

1. a children's game in which all players must imitate only those movements and commands of a leader that are preceded by the words “Simon says.”

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Example Sentences

As we waited, Brave Books’ creative director led the children in a game of Simon Says.

From Washington Post

Compared with hunts for primordial life back on terra firma, it may actually be easier to find ancient biology on Mars, Simon says.

From Scientific American

Four Seasons’ Simon says every beach chair and pool lounger at his resort is snagged by sunrise, and restaurant and spa reservations are booked out.

From Seattle Times

Children in first through fifth grade forwent the snazzy playground equipment — the brightly colored slides, the monkey bars, the tire swing — and instead spent their 30 minutes in the sunshine playing “Mother, May I” or “Simon Says” or “Red Light Green Light.”

From Washington Post

Simon says that Apple rejected several versions of Down Dog that reference getting a discount elsewhere.

From The Verge