Prism

Prism is a picture logic puzzle, also called a nonogram or paint by numbers. Numbers beside each row and column tell you which squares to fill. Fill the right ones and a hidden stained-glass picture appears.

Step by step

1. 1Each number is a group of filled squares in a row, in the same order as the numbers.
2. 2Between two groups there is always at least one empty square. A 0 means the whole line is empty.
3. 3Tap Fill and tap a square to fill it with glass. Drag along a row or column to fill several at once.
4. 4Use Cross to mark squares you know are empty.
5. 5Erase takes a mark away. Right-click a square, or hold Shift, to cross it without changing tool. On a big picture, pinch or use Zoom and Move to look closer.
6. 6When every row and column matches its numbers, the picture is finished.

Tips

• Start with big numbers. In a row of 10, a clue of 8 must cover the middle six squares.
• Rows with a 0, or clues that fill the whole line, are free answers. Do them first.
• A clue turns mint when its line is right, so you can see what is done.
• You never have to guess. Every picture can be solved with logic alone.
• A hint fills a square for you, or shows you a mark that is wrong.

Questions