Rules & objective
Pair every tree with one orthogonally adjacent tent, and every tent with one tree. Tents cannot touch, even diagonally. Match the edge counts for every row and column. Tree cells cannot contain tents.
Controls
Arrows select · Numbers enter · Backspace erases · U undoes
Worked example
Each tent pairs edge-adjacently with one tree and cannot touch another tent by edge or corner. Row and column totals alone do not prove the pairing.