Think slowly. Nothing here is timing you.
Ten logic puzzles that wait while you work. Every board is proved solvable before you see it, and every one of them has a guide explaining how it is cracked.
Grids that argue back
Four puzzles solved by reading what the board has already admitted. No outside knowledge required.
9×9 Sudoku
The dealer hollows out a finished grid one digit at a time and stops the moment a second answer becomes possible. Four difficulty settings, and pencil marks when scanning runs dry.
Minesweeper
Walk the boundary of the open ground and let the numbers argue for you. Mines are laid after your opening click, never under it.
Pixel Logic
Two sets of run lengths, one hidden drawing. Start where a line has the least slack and the overlap hands you squares for free.
Lights Out
A press throws a plus-shaped switch across the board. Order never matters and pressing twice undoes itself, which turns the whole thing into arithmetic.
Getting things into position
Four puzzles where the hard part is not the destination but the order you take to reach it.
Crate Push
Crates only ever move away from you, so a careless shove can end a level without announcing it. Twelve levels, each machine-checked for a solution, with a warning when a crate becomes stranded.
Sliding Puzzle
Finish it in layers and learn the rotation that leaves solved rows alone. Boards are shuffled by legal moves, so none of them are dead ends.
Tower of Hanoi
The one puzzle here with a provable perfect score. Three to eight discs, and the shortest possible route sits beside your own count throughout.
Memory Match
Chunk the grid into corners you can hold in your head rather than trying to track the whole deck. Three sizes, and the clock can be switched off.
Letters, and someone to beat
A grid to search through, and the only board here that plays back at you.
Word Search
Hunt one letter at a time instead of reading the grid. Four themed lists, two sizes, and an option that lets entries run in reverse.
Connect Four
The only board here that fights back. Three computer strengths built on a minimax search, or hand it to whoever is sitting beside you.
Somebody explains the method
Twenty guides, written by the people who built the puzzles. Patterns drawn out cell by cell, not a list of tips. A puzzle you cannot make progress on is not relaxing, it is just annoying. Eight of them are below; the rest are one click further.
All twenty guidesSudoku for absolute beginners
One rule, three ways of applying it, and the scanning habit that finishes your first grid without help.
Beginner 02Minesweeper opening patterns
How to read the edge of an open region, plus the 1-1 and 1-2-1 patterns drawn out cell by cell.
Patterns 03Nonogram solving basics
What the numbers mean, how overlap gives you free squares, and why marking blanks matters as much as filling.
Beginner 04Lights Out is parity, not luck
Why click order never matters, why pressing twice is the same as not pressing, and how to chase the lights.
Method 05Sokoban: planning and deadlocks
The four positions a crate can never come back from, and why solving backwards from the marks is faster.
Method 06A method for the sliding puzzle
Solve it in layers, learn the three-tile rotation, and stop destroying the row you just finished.
Method 07Four Sudoku techniques past the beginner stage
Naked pairs, pointing sets, box-line reduction and the X-wing — and the single idea sitting underneath all four.
Intermediate 08Half of all sliding puzzles cannot be solved
The inversion count that decides it, and why we shuffle from the finished board rather than randomising tiles.
BackgroundBuilt to be closed, not returned to
Ten puzzles and twenty guides, with nothing engineered to pull you back tomorrow.
Shut the tab and the session ends there. Nothing is queued up for your return, and the only trace is a best time sitting in your own browser.
Every page here is deliberately small. Nothing has to be assembled before you can read it, nothing shifts under your finger while it settles, and a board arrives in one piece — which is the entire reason it opens instantly on hardware nobody would call fast.
The generators are where the real work went. Randomness comes from the browser's cryptographic source with biased draws thrown away rather than folded back in, and fairness is demonstrated rather than assumed: the Sudoku dealer counts solutions before it removes anything, the sliding puzzle is stirred by legal moves so it can always be un-stirred, and the twelve crate levels were each solved by machine before anyone was invited to try them.
None of this is claimed to sharpen your mind. That promise supports an entire industry and rests on very little, so we will leave it alone. These are good puzzles and thinking about them is pleasant, which seemed like reason enough to build them properly. Every duration and difficulty on the site is an estimate from our own sessions, labelled as one wherever it appears.