If one of the end numbers in a group exists, fill in the matching number at the other end of the group first.
Fill in any numbers that can be determined by the rules above.
If neither of the end numbers exists in a group, fill in all the possibilities for the numbers that belong in each end triangle, then fill in the possible numbers for the internal triangles in the groups and try again to solve by the rules above.
In these instructions, the numbers shown in black are the numbers as given in an actual puzzle. The numbers shown in other colors are to emphasize specific details.
Remember, some of the exterior game numbers in the colored triangles can help solve the interior game by matching those numbers into the same colored internal triangles.
Solve for the balance of the numbers to fill each pentagon.
Solutions for each puzzle are found at the end of the book.