Tents and Trees — Free Online Logic Puzzle
Pure logic only. Match each tree with a single tent, respect row and column clues, and keep all tents apart — no guessing needed.
How to Play Tents & Trees
Place tents so every tree has exactly one adjacent tent. Trees are fixed, tents go on empty cells.
Each tree must be paired with exactly one tent in a horizontal or vertical neighbor; each tent pairs with one tree.
Tents cannot touch each other, not even diagonally. After placing a tent, mark the surrounding cells as grass.
The numbers outside the grid count tents only. Use grass to mark impossible cells until every row and column matches its count.
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→What Makes Tents and Trees Special
Most logic puzzles give you numbers and ask you to fill a grid. Tents and Trees does something different: it gives you anchors. Those trees aren't just obstacles - they're your starting points. Every tent must touch a tree, which means you're not searching a blank grid; you're working outward from fixed positions.
The genius of the puzzle is how two simple rules create complex interactions. Rule one: each tree gets exactly one tent. Rule two: tents can't touch each other. Separately, these are trivial. Together, they force you to think about spacing, pairing, and territory all at once.
Unlike Sudoku where you fill numbers into cells, or crosswords where you need vocabulary, Tents and Trees is purely spatial. You're managing a campground where everyone wants privacy. The row and column counts just keep you honest - they're checkpoints, not the core mechanic.
The Story Behind Tents and Trees
Tents and Trees was invented in 1989 by Léon Balmaekers, a Dutch puzzle designer. Unlike many logic puzzles that emerged from Japan, this one has European roots - it first appeared in the Dutch puzzle magazine Breinbrekers (which means 'Brain Breakers') in the early 1990s.
The puzzle found its way into the World Puzzle Championship circuit, where it became a regular feature. Competitive puzzle solvers appreciated its clean rules and the satisfying interplay between the row/column counts and the tree-tent pairing constraint. It's one of those puzzles where the rules take 30 seconds to learn, but mastery takes much longer.
What makes Tents and Trees stand out from other grid puzzles is the 'no touching' rule for tents. While games like Minesweeper use numbers to count nearby objects, Tents adds a spatial separation constraint that changes how you think about the board. You're not just counting - you're managing territory.
The puzzle goes by several names: 'Tents', 'Tents and Trees', or 'Campsite' in English-speaking countries. Whatever you call it, the core mechanic remains the same: every tree needs exactly one tent, every tent claims the space around it, and the numbers must add up.
How to Solve Tents and Trees
Choosing Your Grid Size
Why Play Here
Pro Tips From Experience
Hunt the Edges First
Trees along the border have at most 3 neighbors instead of 4. Corner trees? Only 2 options. These constrained trees often solve themselves after a few grass placements elsewhere.
The 'Full Row' Trap
When a row's tent count equals its remaining open cells, beginners rush to fill them all. But wait - are those cells actually next to trees? A cell can be open but still invalid if no tree touches it.
Work Both Constraints Together
Don't just count tents per row. Ask: 'Which tree does this tent belong to?' Sometimes a tent placement is valid by the numbers but leaves a nearby tree with no possible partner. That's a dead end.
When You're Stuck
Stop staring at the same area. Scan for any tree with exactly one open neighbor - that's a guaranteed tent. Then let the 'no touching' rule cascade outward. Fresh eyes on a different part of the grid often breaks the logjam.
Frequently Asked Questions
Tents and Trees vs Other Logic Puzzles
How does Tents and Trees stack up against other popular logic puzzles? Here's an honest comparison.