iPhone app Tic-Tac-Logic: X or O?

Fill all squares so there are no more than two adjacent Xs or Os in a row or column! Each puzzle consists of a grid containing Xs and Os in various places.
The object is to place X or O in remaining squares so there are no more than two consecutive Xs or Os in a row or a column, the number of Xs is the same as the number of Os in each row and each column, and all rows and all columns are unique.

Conceptis Tic-Tac-Logic is a single-player puzzle based on Tic-Tac-Toe, a pencil-and-paper game many of us used to enjoy as children.
Using pure logic and requiring no math to solve, these addictive puzzles offer endless fun and intellectual entertainment to puzzle fans of all skills and ages.

The game features a ruler to help viewing and comparing rows or columns, counters to show how many X and O there are in each row and column, and pencilmarks to place temporary X or O when solving very hard puzzles.

To help see the puzzle progress, graphic previews in the puzzle list show the progress of all puzzles in a volume as they are being solved.
A Gallery view option provides these previews in a larger format.

For more fun, Conceptis Tic-Tac-Logic includes a Weekly Bonus section providing an extra free puzzle each week.

PUZZLE FEATURES

90 free Classic Tic-Tac-Logic puzzle samples

30 extra-large puzzles bonus for iPad only

Extra bonus puzzle published free each week

Multiple difficulty levels from very easy to extremely hard

Puzzle library continuously updates with new content

Manually selected, top quality puzzles

Unique solution for each puzzle

Hours of intellectual challenge and fun

Sharpens logic and improves cognitive skills

GAMING FEATURES

Unlimited check puzzle

Unlimited Undo and Redo

Pencilmarks for solving hard puzzles

Ruler for easy row/column viewing and comparing

Row and column counter boxes

Concurrently playing and saving multiple puzzles

Puzzle library sorting and hiding options

Graphic previews showing puzzles progress as they are being solved

Portrait and landscape screen support (iPad only)

Track puzzle solving times

Backup & restore puzzle progress to iCloud

ABOUT

Tic-Tac-Logic have also become popular under other names such as Binero, Binaire, Binairo, Binoxxo, Noughts and Crosses and Takuzu.
Similar to Sudoku, Kakuro and Hashi, the puzzles are solved using logic alone.
All puzzles in this app are produced by Conceptis Ltd.
- the leading supplier of logic puzzles to printed and electronic gaming media all over the world.
On average, more than 20 million Conceptis puzzles are solved each day in newspapers, magazines, books and online as well as on smartphones and tablets across the world.,

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