Redders IT
Quoxxo
Follow the rules. Fill the grid.
Shared challenge for a solitary puzzle.
Coming soon
How it works
One code.
Same puzzle.
Any device.
Every Quoxxo puzzle generates a unique 7-character code. Share it with anyone — a friend, a colleague, a stranger on the internet. They enter the code and get the exact same grid you played. No account required. No data shared. Just a code.
Your scores stay on your device. Nothing leaves your phone. The code is the only thing that travels.
Solve a puzzle
Play any game — daily, random, or any difficulty.
Share the code
Tap the 7-character code to copy it. Send it however you like.
Race your friend
They enter the code and get the identical grid. Compare times.
The rules
Simple to learn.
Satisfying to master.
Three constraints. No guessing required. Every puzzle has exactly one logical solution reachable by deduction alone.
No three in a row
Three consecutive X or O in any row or column is not allowed.
Equal counts
Every row and column must contain exactly equal numbers of X and O.
No duplicates
No two rows may be identical. No two columns may be identical.
Our promise
No account. No tracking.
No data collected.
Quoxxo stores your puzzle history locally on your device. Nothing is transmitted, no analytics run, no third-party SDKs are included. The app works entirely offline.
Read our Privacy PolicyOrigins
Rooted in a
puzzle tradition.
Quoxxo is inspired by Takuzu — a binary logic puzzle invented in France and popularised in Japan, where the meditative quality of constraint-based puzzles has a long cultural tradition.
The rules are ancient in spirit if not in form: find the one arrangement that satisfies every constraint. No arithmetic, no vocabulary — pure deduction.
Read the full history