We've released an update.

To play and win in this game, you must follow the clues that guide you on how to arrange the gems on the board. As you progress to higher levels, the game becomes more challenging, and to determine the gem positions, you'll need to intersect the current clue with another one that you should be remembering.

You can play directly from the browser by clicking here (or download it for Android):

To assist you with the clues you need to remember, we now allow you to draw colors or shapes directly on the board.

How do you do it? Just tap the square where you want to draw the gem. Each time you tap, you'll switch between features, starting with gem shapes and then colors. If you want to erase a feature you've already drawn on the board, you can tap multiple times until you find the "empty" drawing, or you can press and hold the square.

Here's a level for you, of intermediate difficulty, where drawing on the board comes in handy.