Logic Games Online

Play Sudoku

Play The Daily Extreme Sudoku

Sudoku Puzzle

Sudoku is a logic based number placement game that was invented in the US, then popularized in Japan before spreading to the rest of the world. The goal of the puzzle is to place digits 1 through 9 such that each row, column, and 3x3 box contains exactly one of each digit.

Sudoku Tutorial

Online Sudoku Solver

Play Beginner Netwalk

Play The Daily Expert Netwalk

Netwalk Puzzle

Netwalk is a rotational puzzle game. You are given a network of computers, but all of the pieces have been randomly rotated. Rotate all the pieces such that all the computers are connected to the server, there are no lose ends, and all of the pieces are in use.

Netwalk Tutorial

Play 5x5 Nurikabe

Play The Daily 9x9 Nurikabe

Nurikabe Puzzle

Nurikabe is a binary determination game. You must determine for each cell if it is white or black according to the following rules:

  • All of the black cells must be connected.
  • Each numbered cell must be part of a white island of connected white cells.
  • Each island must have the same number of white cells as the number it contains (including the numbered cell).
  • Two islands may not be connected.
  • There cannot be any 2x2 blocks of black cells.

Nurikabe Tutorial

Play 5x5 LightsOut

Play The Daily 9x9 LightsOut

LightsOut Puzzle

LightsOut is based on a deceptively simple concept. Clicking on a cell toggles that cell and each of its immediate neighbors. The goal is to turn out all the lights, ideally with the minimum number of clicks. There is a fairly easy method for solving the puzzles, but it will very rarely result in the minimum number of moves.

LightsOut Tutorial

Play TenPair

TenPair Puzzle

TenPair is a game of logical elimination. The goal is to clear all the digits from the grid. You clear digits by eliminating two digits that are a matching pair or that sum to 10. They can be eliminated if they are in the same column with no other digits between them, or if they have no digits between them when scanning the grid from top to bottom, left to right. That is, the right end of a row wraps to the left end of the following row.