New puzzle every day — over 1200 logic puzzles in every size and difficulty.
Every day, a new free binary puzzle appears on Logicus, ready to be solved online. The daily puzzle is challenging, but in addition, there are 1200 other binary logic puzzles available in various sizes and difficulty levels.
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A binary puzzle is a logic puzzle where you fill a rectangular grid with two symbols, usually 0s and 1s, following three simple rules.
Each row and column must contain an equal number of 0s and 1s, no more than two identical numbers may sit next to each other, and no two rows or columns can be identical. Like Sudoku, each puzzle starts with a few cells already filled in.
Binary puzzles are popular worldwide and go by many names, including Binairo, Binero, Takuzu, Tohu-Wa-Vohu, Eins und Zwei, Binoxxo, Zernero, Tic-Tac-Logic, and Binary Sudoku.
Each row and column must contain an equal number of 0s and 1s.
No more than two identical numbers may be adjacent (vertically or horizontally).
Each row and column must be unique within the grid.
Look for double numbers next to or below each other. The cells next to doubles can only contain the opposite number.
If there's a free space between two identical numbers, it must always be the opposite number.
There must be an equal amount of 0's and 1's in a row or column. Count! If there are already enough 0s, the remaining cells must be 1s (and vice versa).
Each row and column must be unique. If you're only missing a few cells look for other rows or columns that are similar and enter the opposite numbers.
Testing for rule breaks involves mentally placing the last 0 or 1 in a row or column and checking if it forces the remaining cells to violate the rules, allowing you to deduce the opposite number instead.
Each puzzle has a unique solution. Using the rules above you should never have to guess.