19 games · a new board in each every day · no signup
Classic 9x9, a two-minute 6x6, a giant 16x16, fifteen variant sudokus you will not find together anywhere else (diagonal, windoku, jigsaw, killer, sandwich, frame, outside, thermo, arrow, German whispers, palindrome, kropki, greater-than, anti-knight and skyscrapers) and one played backwards, where the grid arrives solved and you take the clues out of it. Every board has one solution you can reach by logic alone, never a guess. No app, no signup, and a leaderboard decided on the clock.
Fill the grid so that every row, every column and every box contains each digit exactly once. That is the whole rule. The skill is in reading what the printed clues force: a square where only one digit can go (a naked single), a digit that has only one square left in a house (a hidden single), and further up, pairs and locked candidates.
Every Mind Loft board is checked before it ships so that the full solution is reachable by those techniques alone. If you find yourself guessing, there is a deduction you have not spotted yet, and the notes tool is the way to find it.
Sixes if you have two minutes. Suds if you want the classic. Giant if you have an evening. Diag, Window and Quilt are the gentlest steps into variants because the rules barely change: Diag adds the two diagonals as houses, Window adds four shaded boxes, Quilt only reshapes the boxes. Cages, Sando, Frame and Arrow add arithmetic, Mercury, Polka and Sumo add ordering, Five and Racecar draw lines with a rule of their own, Knight and Towers change what sees what, and Rim prints nothing inside the grid at all. Whittle is the odd one out and worth saving until the rest feel easy: it hands you a solved grid and asks you to take the clues out of it.
| Monday | The most printed clues of the week. Singles only. |
|---|---|
| Wednesday to Friday | Fewer clues; locked candidates and pairs start to appear. |
| Saturday | The hardest weekday board. |
| Sunday Edition | Bigger or sparser: a 7x7 Towers, a Mercury with eight printed digits, an Arrow with eight under twelve arrows, a Sando with six, a Frame with two, a Knight with thirteen, a Diag with fourteen, a Window with thirteen, a Five with eleven under eight lines, a Racecar with fourteen under ten, a Rim with thirteen of its thirty-six gutters, a Giant with ninety of 256, a Sumo with no digits at all. |
Whittle is the reverse. The grid arrives solved with eighteen clues printed on it and you remove clues, one at a time, for as long as the grid still has exactly one answer. It is the same reasoning about what a clue is doing, asked from the other end.
Yes. Every board is free in the browser. Signing up only puts your name on the leaderboard and keeps your streak across devices.
Every past board is in the puzzle archive, unscored, so you can practice a variant before the day’s board counts.
The daily sudoku run: Sixes, Suds and one rotating variant (sandwich, jigsaw, arrow, thermo, anti-knight, greater-than, frame or diagonal) on one page, scored half on solving and half on speed, ending in a belt from white to black.
No. Each board is proved to have exactly one solution and to fall to logic. Two independent solvers check every bank before it goes live.