Multiplayer Shut the Box

Multiplayer Shut the Box is no mere luck-driven dice rolling game - it requires arithmetic skills and careful planning! Your goal in the game is to cover the most boxes so as to score as few penalty points as possible. When the game starts, a square board which is evenly divided into 12 boxes will be shown, and the boxes are numbered from 1 to 12. During your turn, click the Roll Dice button on the screen, then cover the box(es) that equals the sum of the roll. For example if 3 and 6 are rolled and give the sum of 9, you can click to cover the box(es) that the sum is 9, such as 9 itself, 3 and 6, 1 and 2 and 6, etc. Note that you must finish your moves within the time limit, as shown by the timer on the screen, or you will lose. If you can cover at least 1 box after a roll, you will be granted an extra turn. But if you cannot do so, the sum of the numbers on the uncovered boxes will be added to your penalty points. All of the boxes will then be revealed and the turn will be passed to the next player. When a player has accumulated 100 or more penalty points, the game ends. The player who has the fewest penalty points win. Will you be able to defeat your opponents with an amazing record?