EdgeNumsThe tricky number puzzle for quick breaks
Place the numbers so that every row and column contains each number exactly once, plus one empty cell. The edge number is the first number you see from that side: it sits in the first or second cell, and only the empty cell may come before it.
Free, right in your browser, no installation needed.
Always uniquely solvable
Every puzzle is carefully vetted and guaranteed to have exactly one solution: pure logic, no guessing.
Pick your challenge
4×4 to get started, 5×5 up to 8×8 in three difficulty levels: from relaxed to really tricky. The big puzzles start with a few numbers already placed.
Track your progress
Timer, statistics and best times show you how you improve.
How it works
- Fill the grid: every row and every column contains each number exactly once, plus one empty cell.
- Watch the edge numbers: each one shows the first number visible from that side. It sits in the first or second cell, and only the empty cell may come before it.
- Reason it out: the clues lead step by step to the only valid solution.