Kakurasu is a fun, challenging puzzle game. Takes a few minute to learn but it is worth it!
RULES:
Find all of the Blue squares such that all of the totals match the clues.
The clues are on the right and across the bottom and are the totals for the respective rows and columns.
The numbers across the top and on the left are the values for each of the squares.
E.g. the first square in a row or column is worth 1, the second 2, the third 3, and so on.
Marking a square in Blue will add that squares value to both the rows total and the columns total.