First click the "randomize" button.

The game simulates real dice tumbling around a board.

If a die is rolled one step, one of its side faces becomes the top face.

In challenge 1, you see nine cubes from the top. Each cube has faces of six different colors.

Click a cube to select it. It is highlighted by a black dot, and its faces are shown on the right.

Now click an empty target position on the same row or column to roll the cube.

The dice can be rolled any distance (a die can roll over other cubes) to an empty position.