Meow Sudoku

Meow Sudoku borrows the sudoku name but plays as a placement puzzle. The board is divided into coloured regions, and your job is to find the exact cells where cats belong.

Three rules decide where a cat can go. Each row can hold only one cat. Each column can hold only one. Each colour region can hold only one as well. On top of that, no two cats may touch. Between them, those constraints mean every cat you place rules out its whole row, its whole column, its whole colour and the cells touching it, so the board narrows as more cats go down.

Two power-ups help when you are stuck: one places a cat for you, and the other shows which coloured blocks can be discarded. You advance through a series of levels, and the developer frames the game around colours and deduction.

Study the board and its colour regions. Place a cat in a cell where it is the only cat in its row, its column and its colour, and where it does not touch any other cat. Keep placing cats until the board is solved. If you get stuck, use a power-up to place a cat automatically or to reveal which colour blocks can be discarded.

The developer does not list the controls for this game. It runs inside the frame above, so a click or a tap on the game is the place to start.

Each placed cat takes its row, column and colour out of play, along with every cell touching it, so rule those out before choosing the next spot. A colour region with only a few possible cells left is the easiest to settle. Stuck? The discard power-up shows which colour blocks can go.

A colour-region placement puzzle with sudoku-style rules, played in a portrait frame. Cats may not touch, and each row, column and colour takes one. Two power-ups are available. The developer lists no controls.

Logic Islands is another grid of strict placement rules, built on Nurikabe across six worlds. Minesweeper Deluxe asks you to deduce where hidden mines sit from the numbered squares around them.