Rule 1: The main objective of Impossible 13 is to reach the number 13 by combining circles with the same number.
Rule 2: To combine circles, you need to find at least three adjacent circles that share the same color and number.
Rule 3: Once you find a suitable group of circles, drag your left mouse button over them to merge them together.
Rule 4: The newly formed circle will have a number one higher than the merged circles, and its color will change accordingly.
Rule 5: Keep combining circles strategically, accumulating numbers higher and higher until you successfully create the ultimate Impossible 13 circle.

Action: Click and hold the left mouse button on a circle.
Action: Drag the cursor over adjacent circles with the same number and color.
Action: Release the left mouse button to merge the selected circles.

No, you need at least three adjacent circles with the same number and color to merge them.

Congratulations! You have completed the objective of the game. However, you can continue playing to achieve a higher score.

No, there is no time limit in Impossible 13. You can take your time to plan your moves carefully.