Neighbors (up, down, left, right) can differ by at most 1. A jump of 2 or more is a cliff
Every row and every column has exactly one summit: its highest value appears in only one square. The arrow at the end of a row or column turns green when its summit is unique and red when it isn't.
Squares marked with a + are surveyed spot elevations and can't be changed. Each map has one solution.
Scoring
Every map starts at 1,000 points. Par is one move per empty square and a target time for the grid (5×5 1:00, 6×6 2:00, 8×8 5:00).
−5 for each move over par. Placing, erasing, changing and undoing all count as moves.
−1 for each second over par time.
The result is multiplied by grid size: 5×5 ×1, 6×6 ×1.5, 8×8 ×3. The minimum is 100 before the multiplier.
Each daily map can be played once. New maps arrive at midnight US Eastern time.
Sharing
Share turns your finished map into a grid of squares that shows how you got there without giving away any elevations.
⬛ surveyed🟩 placed once🟨 changed once🟧 changed 2+ times