One Is the Loneliest Number
Especially if you're on your own today, celebrate Play Hide and Seek by Yourself Day.
This is a very existential day. (Do you see it coming?)
First, go hide.
Then, find yourself.
If someone wants to play hide and seek with you, that's fine. You can pretend you're playing by yourself. Whether you tell the other player(s) that that's what you're doing is your call. It depends on how secure you are.
Playing the game by yourself more than once seems pointless. So after you've played that one time, I guess you just find something else to do for the rest of the day. (Thank you, Capt. Obvious.)
There are plenty of other games that work well when played solo. Solitaire, Double or Triple Solitaire, billiards, darts, Agricola, Suburbia, and the list goes on. Pick one or more and enjoy your day.