Best Grid

Nurikabe is a binary-determination logic puzzle originating from Japan, where it has been published by the puzzle company Nikoli since 1991. Solvers are presented with a grid containing numbered cells and must determine which cells to shade. The unshaded cells form "islands" containing exactly one n...

The TriggerPoint GRID foam roller is a memory foam tool designed to promote muscle recovery and reduce soreness. Its distinctive grid pattern offers varying densities, allowing users to apply targeted pressure to specific areas of muscle tension or trigger points. It’s beneficial for athletes, fitne...

The Zebra Puzzle (often attributed to Albert Einstein, though without firm evidence) is a classic five-house logic grid puzzle that popularized the deductive constraint satisfaction genre in the 20th century.

Killer Sudoku is a logic puzzle that combines the standard Sudoku grid with elements of Kakuro arithmetic. The 9x9 grid contains no pre-filled numbers; instead, cells are grouped into cages marked with a target sum. Solvers must deduce the placement of digits from 1 to 9, ensuring that no number rep...

Fillomino is a grid-based logic puzzle published by the Japanese company Nikoli. The objective is to divide the grid into regions known as polyominoes. Each cell within a given region must contain a number equal to the total number of cells in that region. While some numbers are provided as starting...

Star Battle is a logic puzzle played on a grid that is divided into outlined, irregularly shaped regions. Solvers must place a specific number of stars into the grid such that every row, column, and outlined region contains the required amount. The primary rule constraint is that stars cannot touch...

Snakebird is a 2015 puzzle game by Swedish studio Noumenon Games, known for difficult grid levels about gravity-bound snake-birds collecting fruit.

Thermo-Sudoku is a variant of the traditional Sudoku puzzle that incorporates a constraint based on thermometer-shaped lines drawn on the grid. Along each thermometer line, digits must strictly increase in value starting from the unnumbered bulb end and moving toward the tip. Standard Sudoku rules s...

Hashiwokakero, meaning 'build bridges' in Japanese, is a grid-based logic puzzle published by the Japanese puzzle company Nikoli and also known by the English name Bridges. The puzzle consists of a grid containing numbered circles representing islands, where each number indicates the total bridges c...

Agnes Martin was a 20th-century painter primarily known for her minimalist works featuring subtle grids and pale color fields. Born in Canada, she spent much of her career in New Mexico, exploring themes of meditation and quietude through this reductive style. Her paintings are appreciated by those...

KenKen is an arithmetic logic puzzle invented in 2004 by Japanese educator Tetsuya Miyamoto, who developed it as a teaching tool for his classroom. The puzzle is played on a square grid in which each row and column must contain the digits 1 through N without repetition, forming a Latin square. The g...

German Whispers Sudoku is a variant of Sudoku in which a supplementary constraint applies to marked lines within the grid: adjacent digits along each marked line must differ by at least 5. The constraint is named after the party game 'telephone' ('Chinese whispers' or 'German whispers'), reflecting...

Heyawake is a grid-based logic puzzle published by Nikoli, played on a rectangular grid subdivided into rectangular rooms. The solver must shade some cells according to three constraints: numbered rooms contain exactly the indicated number of shaded cells; no two shaded cells may be orthogonally adj...

Arrow Sudoku is a logic puzzle variant that overlays standard Sudoku rules with arithmetic constraints. The grid features arrows originating from empty circles. The digit placed in a circled cell must equal the sum of the digits placed along the corresponding arrow's path. While standard Sudoku rule...

Loopy is a loop-drawing logic puzzle, included in Simon Tatham's Portable Puzzle Collection, where players draw a single closed loop through grid dots using clues about how many loop segments border each cell.

Yajilin is a logic puzzle published by Nikoli where solvers draw a single continuous, closed loop through a grid. Numbered cells with arrows act as clues, indicating the exact count of black cells located in the specified direction along that row or column. All remaining cells that are not part of t...

Tapa is a wall-shading puzzle invented by Turkish puzzle designer Serkan Yürekli in which cells are blacked out to create one connected wall, guided by clue numbers showing adjacent shaded-cell group sizes.

Numberlink is a grid-based logic puzzle in which solvers must connect pairs of identical numbers using continuous paths. The rules typically dictate that paths must not cross or branch and that every cell in the grid must be occupied by a path. Popularized internationally by the Japanese publisher N...

One Step From Eden is a roguelike game developed by Thomas Moon Kang. It combines real-time action combat on a grid with deckbuilding mechanics reminiscent of titles like Mega Man Battle Network. Players strategically deploy cards to attack and defend against enemies in procedurally generated levels...

Renban Sudoku is a variation of the standard Sudoku puzzle that introduces "Renban lines," which are often highlighted in a distinct color. The digits placed along each of these lines must form a set of consecutive, non-repeating integers, though they can be arranged in any order. For example, a lin...

Snakebird Primer is a 2019 puzzle game by Noumenon Games, designed as an easier follow-up with 70 levels teaching the original Snakebird logic.

The N-Queens Problem is a classic combinatorial puzzle first published by chess composer Max Bezzel in 1848. The challenge requires placing N queens on an N×N chessboard so that no two queens threaten each other, meaning no two queens share the same row, column, or diagonal. Beyond its recreational...

Shikaku is a logic puzzle published by the Japanese company Nikoli, with a name that translates to "divide by squares" or "rectangles." The puzzle is played on a rectangular grid where some cells contain numbers. The objective is to divide the entire grid into non-overlapping rectangles and squares...

Battleships Puzzle is a solitaire deduction puzzle derived from the Battleship board game, in which the solver locates a fleet of ships within a grid using only row and column ship-segment totals and occasional revealed cells.

Skyscrapers is a logic-based combinatorial puzzle originating in Japan that is built on the Latin square mathematical model. The puzzle is played on an N×N grid where the objective is to fill each cell with a height from 1 to N without repeating numbers in any row or column. Numbers placed around th...

SquareCells is a 2015 logic puzzle game by Matthew Brown that asks players to separate a grid into clue-defined groups through deduction alone.

The Knight's Tour is a chess-based mathematical problem requiring a knight to visit every square of the board exactly once, with solutions documented as early as the 9th century by Arab mathematician al-Adli ar-Rumi.

Skyscraper Sudoku is a logic puzzle variant that combines standard Sudoku rules with a spatial visibility constraint. Solvers place digits from 1 to 9 into a grid, treating each number as a building of that specific height. Numeric clues provided outside the grid's perimeter indicate how many buildi...

Calcudoku is a grid-based arithmetic puzzle that follows a format similar to KenKen. Solvers fill a square grid with digits, ensuring that no number repeats within any row or column. The grid is divided into outlined blocks called cages, each containing a target number and an arithmetic operation. T...