free puzzle for wet day displacement activity

Square-Off is a puzzle game based on the japanese “nonogram” puzzles (sometimes called Griddlers, or paint by numbers).
Free trial download link.
Your object in the game is to uncover all the black squares in the grid. To help you solve the puzzle, the number of black squares in each row and column are displayed. The game can be difficult at first, but the techniques are easy to learn. There are three skill levels - each level the board gets bigger, and the game much more hard to solve. very addictive. But it is raining today...more on the wiki