All the rules to regular sudoku apply as well as each number in each "cage" (the boxes with dotted lines) must be unique and add up to the number inside the cage.
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There are various strategies to solving a sudoku puzzle. One of the preferred strategies uses a few smaller tactics. First, one tries to fill in all the 1s, then the 2s, etc. After no more progress is possible this way, one goes to each blank space and lists the possible numbers to go in each. If one gets stuck, one must mentally fill in a number, and continue mentally. If this doesn't work, try the other number. The most important thing to remember is not to fill in a number without being sure of the answer.
There are some rules you have to follow to get to solving the puzzle. Usually there is a 3 X 3 grid with 9 boxes (or 3 X 3 X 3).
The three rules are:
If the game is a 2 X 2 X 2, there would be 4 in a row, a column, and box. 3 X 3 X 3 would be 9 in a row, column, and box. To find out how many will be in each three dimensions (We will call row x, column y, and box z), multiply x X y (x times y).
First, use what you know. You will always get some numbers, no matter what. Always try to see if there is one space open in x, y, or z. This usually gets you 1 step closer to solving.
Second, take risks. Lightly make a number and try it out. If it doesn't work, you know that is not the number to go there.
Third, eliminate. If the grid is a 3 X 3 X 3, and you already have 1, 4, 7, and 9, you know you only need 2, 3, 5, 6, and 8. This will help you prevent from making mistakes.
Practice makes perfect. You might say at first, "This is so hard" or, "This stupid game!" but if you keep playing Sudoku, preferably easy ones to start out, you will get it.