How a coin flip series works
When you invite a friend to play you pick the length: a single flip, best of 3 or best of 5. Each player holds one side of the coin; swapping sides takes both players’ say-so before round 1. Every round both players hit Ready, one coin flips for everyone, and the point goes to whoever’s side landed.
Best of 3 is first to two wins; best of 5 is first to three. The scoreboard updates live on both screens and for anyone watching. Once someone clinches it the match ends, with no pointless extra rounds, and either player can ask for a rematch.
Does best of 3 change the odds?
Not between two equal sides. Each flip is an independent 50/50, so each player still has exactly a one-in-two chance of taking the series, whether it’s one flip or five.
What changes is how it feels. A best of 3 runs two or three rounds, and a best of 5 can swing back from two down. People accept a result more easily after a short series than after a single toss, which is the whole reason “best of three?” gets asked. Agreeing on the length before the first flip keeps it from stretching into best of seven.
Every round is provable
A match seals one server seed and numbers each round. Round n’s result comes from that seed, both players’ seeds and the round number, so the server can’t quietly re-roll a round it doesn’t like. When the match ends the seed is published and every round can be recomputed.
Questions
How many flips is a best of 3?
Two or three. The series ends as soon as one player has two wins, so a 2–0 start finishes it without a third flip.
Can we switch to best of 5 halfway through?
No. The length locks once round 1 is flipped. Before that, either of you can propose best of 5 and the other accepts or declines.
Can other people watch the series?
Yes. Share the read-only watch link and watchers follow every round and the running score live.