Fill each block with 1 up to its size, and never let the same number touch, not even diagonally
Suguru is a number puzzle played on a grid that is split into outlined blocks of one to five squares. A block of two squares holds the numbers 1 and 2, a block of three holds 1, 2 and 3, and so on up to 5. The second rule makes it a puzzle: the same number may never appear in two squares that touch, not even at a corner. Some numbers are given, and the rest follow by logic alone. The puzzle is also published as Tectonic or Number Blocks. Ours builds a new grid each time, fills it, and then removes given numbers one by one only while a solver still finds exactly one answer.
Pick a level: easy is a 5×5 grid with about half the numbers given, medium is 6×6 with fewer, hard is 8×8 with only a handful.
Press New puzzle. Thick lines mark the blocks. Bold numbers are given and cannot be changed.
Tap a square, then a number on the pad. The pad only offers numbers that fit the block, so a 3-square block shows 1 to 3. Clear removes a number.
Every block of k squares must end up with each of 1 to k once; a block of one square is always 1.
Two equal numbers must never touch, side by side or diagonally, even across a block border.
On a keyboard, move with the arrow keys, type 1 to 5, press Backspace to clear and Ctrl+Z to undo.
With Show clashes on, a repeated number in a block, a number too big for its block, or two equal numbers touching turn red. Fill the grid correctly to finish.
Short-range logical deduction. Each square is limited by two sets of rules at once: the numbers still missing from its block and the numbers already in the eight squares around it. Solving means combining those small lists, finding the square or the number with only one place left, and following the chain of consequences. It exercises working memory for candidates, visual scanning of a neighbourhood and careful rule checking, in short bursts that suit a few minutes of play. Another logic game to try next: Shikaku.
Fill every one-square block with 1 first, then look at its eight neighbours: none of them can be 1.
A two-square block is a 1 and a 2. If a 1 already touches one of its squares, that square is the 2.
Work number by number: for a block of five, find where its 5 can go. Only squares in that block can hold a 5, and no 5 may touch it.
Two squares that touch each other and both border a third square limit each other: they can never be the same number.
When a block has only one gap left, its number is whatever the block is missing.
Leave Show clashes on while you learn; the diagonal rule is easy to forget.
Suguru is a logic puzzle on a grid divided into blocks of one to five squares. Each block of k squares contains every number from 1 to k exactly once, and equal numbers are never in neighbouring squares, including diagonal neighbours.
Yes. Tectonic and Number Blocks are other names for the same rules. This game is our own build that is not connected to any publisher of the puzzle.
No. The no-touching rule covers the whole grid: two equal numbers may not share a side or a corner anywhere, whether or not they are in the same block.
Yes. The generator draws random blocks and fills them, then takes given numbers away one at a time in random order. A removal is kept only if the solver still finds exactly one way to complete the grid, so every puzzle shown has a single answer.
Easy keeps at least 45% of the squares filled, medium at least 30% and hard at least 14%, and more stay whenever removing them would allow a second answer.
Grid size and the number of givens: easy is 5×5, medium 6×6, hard 8×8. Each level keeps its own best time.
It is free with no sign-up. Your best time per level, the number of puzzles you have solved and the Show clashes setting are saved in this browser only.