Sparse Start

Find any valid solution to this lightly clued 4 × 4 Sudoku.

Your activity is getting ready…

Take a break whenever you like. Your session results stay in this browser. This activity is for practice, not a cognitive assessment.

Keep the curiosity going.

More ways to explore reasoning.

Find a steady rhythm.

Notice the rate of growth.

Two rules share one trail.

Study the spaces between terms.