PicrossST is a nonogramme puzzle game for the Atari ST, similar to Nintendo's Picross series.

The player is presented with a grid, surrounded by numbers on the top and left sides. These numbers represent the number of squares on that row or column that shall be filled. On a 15x15 grid, a number fifteen means that the entire row or column should form a straight line across the grid, whereas the numbers ”10, 3” on the left mean that that row should have one line of 10 filled squares and another shorter line of 3 squares. These lines must have at least one blank square to separate them. Using deduction, it is possible to fill in all the right squares, thereby forming a simple picture.

The implementation in PicrossST starts out with the program choosing to reveal a row and column at random to help the player out. After that, he is on his own. Using the mouse, squares can either be coloured or marked as presumably empty, a bit like Minesweeper. Marking a blank square as empty is punished with a time deduction, which means that you can trade time for hints.

Two players may play at once, but in a cooperative manner. The game also comes with a grids editor for constructing puzzles of your own.

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