There is no one official rulebook for hide and seek. This page shows the standard game played in most homes and playgrounds, and then the famous extra versions. This page has no sign-up and nothing to buy.
One player is the seeker. The seeker closes their eyes and counts. Everyone else runs and hides. Then the seeker opens their eyes and hunts. The last player found is the winner of the round.
Players: 3 or more. More hiders means more fun. What you need: a place with good hiding spots, and edges everyone agrees on.
The standard printed rule (the one in the game's Wikipedia article, matching most playgrounds) says the first player found becomes the seeker in the next round — first found "loses" and seeks — while the last found is the winner.
Some playgrounds play it the other way: the last player found seeks next, as a kind of prize for hiding best. Both are real ways kids play. Pick one before the first count.
Moving to a new hiding spot: In the base game, hiders stay where they hid. In home-base racing versions, moving is the whole point. Agree which game you are playing.
Peeking during the count: Never allowed, in any version. Eyes closed means eyes closed. Groups that catch a peeking seeker make that seeker count a whole extra round.
Hiding in locked rooms, cars, or off-limits places: Out, everywhere. Boundaries agreed at the start are safety rules, not game rules — they beat every version on this page.
Seeker — the player who counts and hunts.
Home base — the spot where the seeker counts and found players wait.
Olly olly oxen free — the call that frees any hiders still hiding. The round is over.
The seeker found everyone but me and quit. Did I win?
Yes. If the seeker calls "Olly olly oxen free," the hiders still hidden have beaten the round.
Can I hide in the same spot as a friend?
In plain hide and seek, yes — but if the seeker finds the spot, you are both found together. In Sardines, sharing the spot is the game itself.
How long should the seeker count?
Long enough for everyone to reach a hiding spot. Small room: 10. Backyard: 20 to 50. Whole park: 100 — with a grown-up's agreement about boundaries.
Source: the standard published rules of Hide-and-Seek as collected at Wikipedia, "Hide-and-seek," including the Forty Forty family, Sardines, Kick the Can, and Ghost in the Graveyard. Read in full and rewritten in our own plain words. The next-seeker rule is printed both ways because playgrounds print it both ways.