Version 0.3.2 - 12x12~13x13, mine cluster ban

Hello.

With this update, 12x12 and 13x13 boards have been added.

In addition, we have excluded mine clusters that may still require guesswork—that is, cases where all cells surrounding a mine are mines—and in the process, we have adjusted the mine ratio from the previous 40% to around 30-32%.

Thank you again for enjoying the game!