Logical Colors

About Logical Colors

A Logical Colors puzzle consists of an array of colored blocks.  Here is an example:
















Clicking on a block causes it to change color.  
The objective of the puzzle is to change the colors so that each of the blocks is set to one of only two colors.  

Over 10 billion billion colorations satisfy this requirement. 

However, Logical Colors has three rules limiting the way the colors are to be arranged:
  Rule 1:  Every row and every column must have an equal number of blocks of both colors.
  Rule 2:  No row and no column may have more than two adjacent blocks of the same color.
  Rule 3:  There may be no duplicate rows or duplicate columns.

Here is an example of a correctly colored solution to the puzzle shown above:


















Even with the three rules there are still over a million different ways to color the blocks.

In a Logical Colors puzzle, a few of the blocks are locked; their color cannot be changed. 

This limits the possible solutions to a single, unique, arrangement. 

For the example shown above, the blocks initially colored black or white were locked.

The Controls

Touching a block causes it to cycle through its possible colors.

If you find you have made a mistake or have reached a dead end, click the “Undo Move” button to back up

as many moves as desired. 

If you are totally confused, press the “Restart Game” button to return to the beginning.

After you have solved a puzzle, select “New Game” to get a completely new puzzle.

The Puzzles

The first few Logical Colors puzzles are easy.  Solve 10 of these puzzles to open the next level of difficulty. 

The number of puzzles successfully completed is displayed below the array of blocks.

Solve 25 puzzles to gain access to the full range of puzzles. 

There are over one-half million puzzles of varying difficulty available.

Logical Colors puzzles are problems in logic.  Every puzzle can be solved by careful observation of the three rules. 

Some may be quite tricky, but guesswork is ever necessary.

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