Make a complete pattern pass
First scan rows for adjacent pairs: 00 must be bordered by 1 where a neighboring cell is open, and 11 must be bordered by 0. Next scan for separated matches. In 0 _ 0, the middle value is 1; in 1 _ 1, it is 0. Move from the top row to the bottom without stopping to chase unrelated ideas.
Repeat the pass vertically. A pattern that was invisible in a sparse row may be obvious in its column. Enter each forced value as soon as you prove it, because it may create the next usable pair on the crossing line.
Turn four-of-each into progress
Now count lines with several known cells. If a row already contains four ones, every blank in that row is zero. If it contains three zeros and only one of two blanks can accept another zero without making a triple, the other blank is forced. This combination of quota and placement restrictions is more useful than counting alone.
Work through all eight rows, then all eight columns. Repeating a fixed direction reduces missed lines and makes it easier to resume after a pause.
Compare lines before they become duplicates
When two rows share six or seven positions, compare their remaining blanks with any completed row that has the same pattern. The unfinished line must resolve differently. Balance and no-three constraints tell you which of the two remaining arrangements is legal. Columns deserve the same comparison, even when most of your recent work happened horizontally.
If no move appears, use Check to reveal current rule conflicts or ask for a Hint. The hint describes a logical next step; it is more useful for learning than filling random cells until something works.
Print the 8x8 grid for an offline solve
Select your preferred difficulty and use Print to create a clean copy of that puzzle. Printing preserves the starting clues rather than the numbers you entered online, which makes the sheet suitable for a fresh attempt, a trip, or a screen-free break. The paper layout also includes the balance target and the other two rules.
For a tidy paper solve, mark only values that are forced and circle a line after it reaches four zeros and four ones. At the end, compare each line with the seven others of the same type before declaring the puzzle complete.
Solve an 8x8 grid in repeatable passes: patterns, balance, uniqueness, then a full rescan. That rhythm works online and on the printable copy, and it prepares you for the broader 10x10 grid.