what this site keeps

a cookie called blunder_player with a random number, so the site knows whether you've had your move today. it doesn't say who you are.
a scrambled code for your internet connection, so no more than 3 people on one wifi can play each day. it's a one-way scramble that changes every day, so it can't be turned back into your address, and your actual ip address is never saved. each code is wiped once its day is over, and if you don't come back for 2 days, everything about you is deleted too.
the moves, the finished games and how many people played them. no names.
a robot check from Cloudflare Turnstile when you make a move, to keep bots out. Cloudflare runs that check.
your browser keeps the last board it saw and which move was yours, only on your own device, so the page still works if the board is napping.

there are no ads, no trackers and no accounts.