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Sign in to host or join games. Your wins, losses, and the players you use are saved to your account.
New here? Choose Create account.
Name a player. The next person names something he shares with someone else. Miss the link and you're out.
Finds whoever's waiting and closest to your rating in that sport.
A slow game has no clock until the other person opens it — invite a friend and answer whenever.
Accounts here are a username and a password, with no email attached, so there is no reset link to send. Change it while you are signed in and keep it somewhere safe.
This removes your account, your username, your stats and your place in any game you are in. It happens immediately and cannot be undone.
Finished games stay in other players' histories with your name on the chain, because the chain is theirs too.
A chain game. Someone names a player, someone names something the next player shares with him — a club, a school, a number — and on it goes until somebody misses the link.
Rosters, schools and numbers are assembled from public record. No league, club or school is involved in this game, and none of their marks or artwork appear in it — every crest and portrait you see is drawn by the app from the name itself.
The information used here was obtained free of charge from and is copyrighted by Retrosheet. Interested parties may contact Retrosheet at www.retrosheet.org.
Player, school and season records from the Baseball Databank (Lahman database), licensed under Creative Commons Attribution-ShareAlike 3.0 Unported, and from the Chadwick Baseball Bureau register, in the public domain.
Current-season rosters and uniform numbers from MLB's public Stats API. Retired-number lists adapted from Wikipedia, licensed under Creative Commons Attribution-ShareAlike 4.0.
Historical player seasons derived from FiveThirtyEight's RAPTOR data set, licensed under Creative Commons Attribution 4.0, and from the sportsdataverse project.
Rosters and player records from the nflverse project, which publishes them for public use.
Ball Knowledge is not endorsed by, affiliated with or sponsored by the National Football League, the National Basketball Association, Major League Baseball, the NCAA, or any club or university named in it. Player and team names are used to state facts about who played where.
Saira Condensed and Barlow, used under the SIL Open Font License 1.1.
What the game stores about you: the username you chose, a password that is only ever kept as a one-way hash, the games you played and the points you scored. That is the whole list.
There is no email address, no phone number, no contacts, no location and no advertising. Nothing you do here is sold or shared, and no third-party analytics or tracking code runs in the app. Chat messages are delivered live between players and are never written down.
Delete your account on the Account screen and all of it goes, immediately.
Questions: the contact address on the App Store listing.
This is what everyone sees at the table.
Only games between people count here. Rounds with a computer in them are tracked on your stats page instead.
Room code
Players join from the Ball Knowledge page with this code.
Play alone against the computer, or add one to fill out a game.
Waiting for the host to start…
| Player | Points | Guesses | U/D/M | Traps | Best pull |
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