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Every board has a limited number of cats to place. A cat cannot share a row or column with another cat, and each colored area can have only one. There is one more rule to watch: cats cannot sit next to each other. That includes diagonal spaces, so a cat can rule out more squares than expected. The trick is to look at the board as a whole. If a cat cannot go in several cells because of an occupied row, column, color, or nearby cat, the remaining cells become much easier to spot.
You do not have to place a cat every time you find a possible position. An X mark can be used to cross out a cell that will not work. This is useful when a puzzle has several possible choices and you need more information before committing to one.
As more cells are crossed out, the board starts to open up. One correct cat can also remove several possibilities around it, giving you new clues for the next move.
The controls are straightforward. Click a cell to place an X mark, or double-click it to put a cat there. There is no complicated movement to learn, so most of the attention stays on solving the puzzle.
Catdoku has a quiet pace and rewards patience rather than quick reactions. Early moves can be fairly easy, but harder boards may leave you staring at the same few squares for a while. That makes each correct placement feel useful because it can change the options across the rest of the grid.
Hints are available if you get stuck, and the increasing puzzle difficulty gives the game enough variety for both quick sessions and longer attempts.
Open the game, check the clues, mark the impossible cells, and work toward giving every cat its own safe spot. The rules are easy to learn, but finding the complete solution takes careful thinking.