A 3x3 OSRS bingo board: nine tiles for a single evening or a small clan. Free board, full tile pool, and the rules that make a short event work.
Nine tiles is the right size for two things: a clan under fifteen members, and an event that starts and finishes in one evening. Both fail on a 5x5 board, for the same reason - not enough player-hours to fill the grid, so the event ends with most of it blank.
A 3x3 is also the board to run first. It takes twenty minutes to set up, the whole clan sees it resolve the same night, and the next event gets a bigger turnout because the first one visibly finished.
Three in a row is the win condition, and on a 3x3 that is reachable in an evening. Say up front whether diagonals count.
With nine tiles, one unreachable tile ruins the board. Check every tile against your newest member, not your best one.
Short events live on live updates. Post each completion in Discord as it lands and the evening carries itself.
The board above is drawn from this pool. Swap any tile for another at the same difficulty and the points stay balanced.
Not for a small clan or a single evening. Nine tiles across fifteen members is roughly the same density as twenty-five tiles across forty, which is where a 5x5 starts to work.
A line of three, with the full board as a tiebreaker. Points-only scoring on nine tiles usually ends in a tie.
This board is free to copy, edit and post. Tracking 9 tiles across a clan - submissions, screenshot approval, team standings, Discord updates - is the part that eats a host's weekend. An OSRSHub server does that for $12.10/month.