Generate Puzzle on difficulty
Forbidden pattern:
Size: x
The goal of this puzzle is to fill in every square with a red or blue piece, so that there is no group of pieces of the same color following a certain pattern. For example, it might be required that the grid has no horizontal, vertical, or diagonal lines of 4 pieces of the same color.
You can choose one of 20 different patterns, arranged roughly by difficulty from easy to difficult, according to how long it takes me to solve each one. I tried to represent the patterns in pictures, but you can also discover them by placing pieces.
All puzzles are randomly auto-generated, and have a unique solution. There are three difficulty levels:
Easy can be solved with simple logic only, and has some extra clues.
Normal can be solved with simple logic only, and has a minimal number of clues.
Hard requires more complex logic or guess-and-check, and has a minimal number of clues.
Controls
Click on a square to place a piece in a square or remove one. Squares with a grey background are clues and can't be changed. If you make one of the forbidden patterns, you will see a line through the pieces that make it up. If you solve the puzzle, a green border will appear.
To try a guess, hit the Guess button, and it will keep track of the initial guess you make (green) and everything you can deduce from that (yellow). Then:
Click "Accept" if you think you made the right guess. You will keep everything you did in Guess mode.
Click "Reject" if you think you made the wrong guess. You will only keep the opposite of the initially guessed piece.
Click "Ignore" if you don't know if the guess was correct. You won't keep any of the guessed pieces.
This game is by Michael Gottlieb, 2017-8. I first saw this type of puzzle as "Disconnect Four" in the iOS app "Logic Games" by Andrea Sabbatini.