Tametsi

What Is Tametsi?

Tametsi is a logic deduction puzzle that layers two independent constraint systems onto a single grid. Like classic Minesweeper, each revealed safe cell shows an adjacency count — the number of mines among its eight neighbors. Unlike Minesweeper, Tametsi surrounds every grid with row and column mine-count hints in the style of a Nonogram: the edge of each row and column tells you exactly how many mines that line contains. You solve by combining both systems — cell-level adjacency clues and line-level totals — until every mine is located.

The two constraint layers complement each other in a way neither game achieves alone. Row and column totals give you a global picture of mine distribution before you uncover a single cell. Adjacency numbers then pinpoint individual cells within lines that the totals alone cannot resolve. Where classic Minesweeper regularly reaches a dead end and forces a coin-flip guess, Tametsi's double-constraint system closes every gap. Every board published on minesweeper.org is verified no-guess solvable by a server-side constraint solver before you ever see it.

Three difficulty levels cover a wide skill range. Beginner (9×9, 10 mines) is the ideal starting point — the grid is small enough to hold the whole picture in your head while the row/column hint system teaches its fundamentals. Intermediate (16×16, 40 mines) requires chaining adjacency and line constraints together across a board large enough that no single technique dominates. Expert (16×30, 99 mines) matches the density of classic expert Minesweeper but remains fully solvable — an achievement that feels qualitatively different from beating a random expert board that required several lucky guesses. A fresh daily puzzle is generated at midnight UTC for each difficulty level.

How to Play Tametsi

1. Start the game. Click the green ✕ in the top-left corner. This starts the timer and opens the starting region — all cells connected to the corner through zero-adjacency cells are revealed at once via flood fill, exactly as in classic Minesweeper.
2. Read the row and column hints. Each edge shows two numbers: a green "remaining" count that decrements as you flag mines, and a grey "total" that never changes. When the green count hits 0, every unflagged cell in that line is safe. When the number of hidden cells equals the green count, every hidden cell in that line is a mine.
3. Reveal safe cells. Left-click any hidden cell to uncover it. A number appears showing how many of its up-to-eight neighbors contain mines. A blank cell means zero mine neighbors — the flood fill expands automatically. Clicking a mine ends the game.
4. Flag mines. Right-click (or long-press on mobile) to cycle: hidden → 🚩 flagged → ❓ uncertain → hidden. Each flag automatically decrements the green remaining count for that cell's row and column.
5. Win. You win as soon as all mines are flagged or all safe cells are revealed — whichever you accomplish first. You do not need to do both.

Tametsi vs. Classic Minesweeper

• Extra hint layer. Classic Minesweeper gives you only adjacency counts as you reveal cells. Tametsi adds row and column mine totals visible from the very first move, giving you a global picture of mine distribution before you uncover anything.
• Always solvable by logic. Standard Minesweeper boards regularly force guesses — an isolated corner, a region with two equally valid configurations. Every Tametsi board here is guaranteed to have exactly one solution reachable entirely through deduction. No coin flips, ever.
• Same standard sizes. Beginner (9×9, 10 mines), Intermediate (16×16, 40 mines), and Expert (16×30, 99 mines) match the classic Minesweeper grid dimensions, so experienced players can directly benchmark their logic speed against familiar board shapes.
• 3BV speed metric. Like competitive Minesweeper, Tametsi tracks 3BV (Bechtel's Board Benchmark Value) — a measure of board complexity independent of luck. Your 3BV/s score is recorded alongside your time, enabling fair cross-board comparisons on the daily leaderboard.
• Shared daily boards. A specific board is fixed for each difficulty every day, so the entire community competes on identical layouts. Classic Minesweeper generates a fresh random board for every player; Tametsi's daily format creates a truly shared competitive experience.

Tametsi vs. Tentaizu

Both Tametsi and Tentaizu are minesweeper-adjacent logic puzzles with a no-guess guarantee, but they are structurally quite different.

• Tentaizu has no reveals. In Tentaizu, all clue cells are visible before you begin, and you never uncover anything — you only annotate cells with flags or safe marks. The board is static; only your markings change. In Tametsi you actively reveal cells, changing the board state and unlocking new adjacency information as you play.
• Different clue types. Tentaizu uses only pre-placed adjacency counts as clues, with no row or column totals. Tametsi is the opposite emphasis: row and column totals are always present, while adjacency clues emerge dynamically as you reveal cells.
• Different scale and pace. Tentaizu is always a compact 7×7 grid with exactly 10 mines — completable in well under a minute once you learn the patterns. Tametsi scales from beginner (9×9) to expert (16×30), with solve times that can run several minutes on the harder boards.
• Same no-guess philosophy. Both games guarantee every puzzle is uniquely solvable by pure deduction. Neither should ever require a random guess. If you are stuck, you have missed a deduction — not run out of information.

Strategy Tips

1. Read all line totals before placing a single flag. After the opening flood fill, scan every row and column hint. Lines with a total of 0 contain no mines at all — reveal every cell in them immediately. Lines where the total equals the number of hidden cells are fully mined — flag every hidden cell at once. These free resolutions often cascade into further deductions.
2. Watch the green "remaining" counters. Every flag you place decrements the green count for that cell's row and column. A counter dropping to 0 makes every remaining unflagged cell in that line safe. Keep an eye on counters approaching zero — they are your next free reveals.
3. Cross-reference adjacency clues with line totals. An adjacency clue might leave two equally likely candidates, but a row total can eliminate one of them. Never analyze a cell in isolation — always check whether the outstanding line counts confirm or rule out a candidate.
4. Use constraint subtraction between adjacent lines. If two adjacent rows share a region of unknown cells, the difference between their remaining counts tells you the net mine count in the non-shared cells. This subtraction technique extends the same pattern used in classic Minesweeper to entire rows and columns.
5. Corners and edges first. A corner cell has only 3 neighbors; an edge cell has only 5. Their adjacency clues are the most constrained and often the first to resolve cleanly. Combined with the tight row/column totals that corner regions produce, the perimeter almost always provides the strongest opening deductions.
6. Use the global mine count in the endgame. The mine counter shows how many unflagged mines remain. When you are down to the last few, scan the entire board for configurations consistent with both the remaining count and all outstanding line totals. Global reasoning becomes extremely powerful once local options are exhausted.