Number Patterns
Spot the rule behind each sequence with a free, browser-based logic game. Arithmetic, geometric, square, and Fibonacci patterns included.
Logic & PuzzlesMissing Number Grid
A grid where every row and every column contains each number exactly once — that is all a Latin square is. Below: the one-step rule that solves it, and why you should read the row before the column.
Choose your difficulty
Pick a level to start playing. You can switch at any time.
How to play
Work out which number belongs in the empty cell, then tap it.
Tip: your progress and best score are saved in this browser only.
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Logic & PuzzlesWhat you are actually practicing
A Latin square is a grid where every row and every column contains each number exactly once. That is the whole rule. Once you have seen it, a missing cell is a one-step problem: look along the empty cell's row, find the number that is absent, and that is the answer.
The skill it trains is scanning a small grid for a missing value without losing your place — the same thing you do with Sudoku, but small enough to finish under a timer.
How the game works
You are shown a grid with one empty cell and four candidate numbers. Pick the number that belongs there. A wrong pick reveals the answer immediately.
Easy uses a 3×3 grid. Medium uses 4×4. Hard uses 5×5, where reading the wrong line is much easier.
The relationship worth knowing
Every row and every column is a permutation of 1 to n. In a 4×4 grid, each row contains 1, 2, 3 and 4 exactly once.
The row alone is usually enough. The empty cell's row contains all but one of the numbers, so the missing one is the answer. You rarely need the column.
The column is the cross-check. If the row gives you one candidate, the column must agree with it.
Strategies that actually raise your score
Read the row, not the column. The row is shorter and usually already narrows it to one value. People instinctively scan downwards and lose time.
Count the numbers you see, not the ones you remember. Look at the row, list the numbers present, then find the one that is not in that list. Visual scanning is faster than mental arithmetic.
Use the column to confirm, not to solve. If the row leaves two candidates, the column breaks the tie in one look.
Start from the blank, not from the corner. The grid is complete except for one cell, so everything you need is on that row or that column. There is no need to solve the whole square.
Where the real difficulty shows up
A 5×5 grid has five rows to misread. The rows get longer and it becomes easy to read the wrong line. Trace the blank cell's row with your finger before counting.
Do not assume the pattern continues. These grids are not arithmetic sequences; they are permutations, and a row can look like 2 4 1 3 with no pattern at all beyond using each number once.