Score
0
Time
150s
Best
—
Inequality logic puzzle. Fill a 5×5 grid with 1–5 so every row and column has no repeats, and obey every greater-than / less-than sign between cells. Solve as many as you can in 150 seconds.
Tap a cell to cycle its number 1, 2, 3, 4, 5, then empty. Every row and every column must contain each of 1 to 5 exactly once, just like Sudoku.
Between some neighbouring cells sits a greater-than or less-than sign. The number on the open, wide side of the sign must be larger, and the number on the pointed side must be smaller. A sideways sign compares left and right cells; an up or down caret compares the cells above and below it.
A cell or a sign turns red when a rule is broken — a repeat in its row or column, or two filled neighbours that violate the inequality between them — so mistakes are easy to spot.
A few cells may already hold a locked number to get you started. Finish a grid to score a point and a fresh puzzle appears instantly. Solve as many as you can before the timer runs out.
Hunt for the extremes first. In any 5×5 a 1 can never sit on the wide side of a sign and a 5 can never sit on the pointed side, so a long chain of inequalities pointing the same way pins its ends almost immediately. A run like a < b < c < d forces the smallest cell toward 1 and 2 and the largest toward 4 and 5 before you place a single repeat-check.
Count the length of each inequality chain. If three cells in a row are linked by signs all opening the same direction, the lowest can be at most 3 and the highest at least 3, which often collapses to a single candidate once the row's other digits are known. Treat every chain as a mini ranking and the no-repeat rule fills the gaps.
Locked starting numbers are gold — combine them with a neighbouring sign right away. A given 4 with a less-than pointing into it can only be fed by a 5, and a given 2 on the open side of a sign means its partner is a 1. These paired deductions cascade faster than scanning rows blindly.
In the timed mode, never guess into an empty grid. Place every forced extreme, let rows and columns eliminate candidates, and only then cycle a doubtful cell. A wrong digit lights up red within a tap or two, so back it out and move on — keeping a clean board beats racing into a tangle you have to unpick.