Real Kakuro 20x20

Real Kakuro 20x20 is based on a puzzle called Kakuro. The puzzle is rather like a crossword puzzle but uses added numbers. A box is show with a \ in the middle. The number on the bottom left is for the column directly below. The number of the top right is for the row directly right. Each row or column uses the numbers 1 through 9 but each uses each number only one time and must add up to the shown number clue. This version is much the same as Real Kakuro but this time, the game board is twenty by twenty squares rather than ten by ten. The game has ads but they can be disabled with an in-game purchase.