- By tapping the space between the two letters around the circle, you can place the letter located in the center of the circle to any position on the circle you desire.

- By placing a '+' between two same letters, you can combine these letters and obtain the next letter in the alphabet.

- When you catch a symmetry in the letter sequences on the circle, you can combine more letters with '+' at once, destroy more letters and earn more points.

- The number of letters that can be placed on the circle is limited. Therefore, the game will end when there is no room left on the circle.

- Before the circle is filled with letters, you should combine the letters and aim to constantly reduce the number of letters on the circle.