Binary logic grids
Balance zeros and ones in each row and column.
Example
Example
The highlighted square follows two zeros. Which symbol avoids three in a row?
Choose a number to try it.
Use three zeros and three ones in each line.
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1 puzzle · No time limit
One answer, reached by reasoning alone. No guessing.
On by default unless you turn it off. Saved choices are kept. Shares starts, completions, replays and error categories. For ChatGPT visits, starts and completions may include the first QuickenBrain page and country. No answers, drawings or names.
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Balance zeros and ones in each row and column. Avoid three matching symbols consecutively, and do not duplicate a row or a column.
Choose a difficulty, then select Start. Hints first show where to look. You decide whether to reveal the reasoning or apply a step. Undo and redo let you revise your work.
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About this practice
Balance zeros and ones in each row and column. Avoid three matching symbols consecutively, and do not duplicate a row or a column.
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On by default unless you turn it off. Saved choices are kept. Shares starts, completions, replays and error categories. For ChatGPT visits, starts and completions may include the first QuickenBrain page and country. No answers, drawings or names.
How this data is used