Score
0
Time
180s
Best
-
Number logic puzzle in the Str8ts style. Fill a 6×6 grid with 1–6 so no row or column repeats a number, and every white run between black cells forms a straight of consecutive numbers. Solve as many as you can in 180 seconds.
Tap a white cell to select it, then tap a number from 1 to 6 on the pad below. The ⌫ key clears the cell. Gold numbers are givens and cannot be changed.
No number may appear twice in the same row or column. A number printed inside a black cell also counts: it blocks that number for every white cell in its row and column.
Black cells split each row and column into runs of white cells called compartments. Every compartment must hold a straight — a set of consecutive numbers in any order. A run of three could be 4, 2, 3 or 6, 5, 4, but never 1, 2, 4.
Cells turn red when a number repeats, or when a full compartment is not a straight. Finish a grid to score a point and a new one appears at once, with fewer givens each time. Solve as many as you can before the 180 seconds run out.
Start with the long compartments. In a 6×6 grid a run of four cells can only be 1–4, 2–5 or 3–6, and all three of those ranges contain 3 and 4, so a four-cell run must hold both 3 and 4 somewhere. A run of five must hold 2, 3, 4 and 5. These 'sure numbers' often collide with a given in the same row or column and pin a cell immediately.
Use black-cell numbers as eliminations for the whole line. A 1 printed in a black cell means no white cell in that row or column can be 1, so any compartment there cannot start from 1 — its range shifts upward. Look for compartments where the missing low or high end forces the whole straight into one position.
Once a compartment has one or two numbers placed, write off everything too far away. If a three-cell run already holds a 5, it can only be 3–5, 4–6, or somewhere in between, so a 1 or 2 is impossible anywhere in it. Combining that with the row and column rules is how most cells get solved without guessing.
The givens thin out as you score, so later grids reward this range thinking more than the early ones. Str8ts was invented by Jeff Widderich and Andrew Stuart; this is a compact 6×6 take on the same rules, sized for a phone and a three-minute clock.