Hitori is a logic puzzle game where the goal is to eliminate numbers by blacking them out while following specific rules. Here's how to play my simple version of 5x5 Hitori. 

Objective 

The objective of the game is to black out numbers in the grid so that the remaining numbers satisfy the following rules: 

1. No duplicates in rows or columns: Each number can appear only once in any row or column. 

2. No adjacent black cells: Blacked-out cells cannot be horizontally or vertically adjacent, but they can touch diagonally. 

3. All remaining cells must be connected: The remaining (non-blacked-out) cells must form a single connected group, meaning you can move between them horizontally or vertically without crossing a black cell. 

Game Controls

- Start new puzzle at any time by clicking ”New Puzzle” button. 

- Show Solution: If you're stuck, the solution can be revealed. Mocking Kaomoji is displayed and time is not saved as high score.

- You can quit game and move back to title screen by clicking ”Quit” button. 

- Click on a numbered cell: Toggles the cell between blacked-out and not blacked out.

Game flow 

1. Title Screen: 

- The game starts with a title screen displaying the rules of Hitori. 

- Click "New Puzzle" to begin the game. 

2. Playing the game: 

- A 5x5 grid is displayed with numbers. 

- Click on a cell to color out the number you want (duplicate number on a row or column), a black brush mark is added. 

- Invalid moves are visually highlighted: 

- Red brush mark: blacked-out cells that are adjacent to eachother, breaking rule number 2. 

- Red cells: Cells that are isolated, breaking rule number 3. 

3. Game Solved: 

- When all rules are satisfied, puzzle is solved and all the brush marks turn to green.

- The game tracks the time it takes to solve the puzzle. Your best time is saved.

- A congratulatory Kaomoji is displayed. 

Visual Indicators

- Black brush marks: You have blacked out the number. 

- Green brush marks: Blacked-out cells in a solved puzzle. 

- Red brush marks: Invalid blacked-out cells (e.g., adjacent black cells, rule 2). 

- Red background: Isolated cells that are not connected to the main group of cells (rule 3). 

Enjoy solving the puzzles and improving your logic skills!