Rule 1: Control the black snake to collect red squares.
Rule 2: Avoid colliding with the snake's own body or any black square obstacles.
Rule 3: Eating a red square increases the snake's length by one block.
Rule 4: Achieve a score of 20 to complete the current level.
Rule 5: The map wraps around, meaning exiting one side of the screen brings you to the opposite side.

Action: Use the Up arrow key to move the snake up.
Action: Use the Down arrow key to move the snake down.
Action: Use the Left and Right arrow keys to move the snake left and right, respectively.

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If the snake touches its own body, the game will end, and you'll need to restart the level.

The game requires a score of 20 to complete a level, meaning you need to collect 20 red squares.

The black squares are obstacles. Colliding with them will also result in a game over.