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Change all cube black.

Tap the upper side of blocks to choose 1 lane from 9 lanes.
Tap the right or front side of blocks to choose a layer, upper, middle or bottom.
Choose 1 block and Push change color button.
Then, the color of the chosen block and next to it are changed black to white or white to black.
If you set all block color to Black, you clear the stage.
There are 25 stages.