Tap Play button and tap an image in the list.

Images are available in blocks of 6 images.
You get to the next block completing all images in the current block, but you can also open the next block simply by watching an ad.

Tap the differences between both images.

Touch surface with two fingers and move them apart to zoom in.

Touch surface with two fingers and bring them together to zoom out.

Tap the light bulb to get a hint.

You can watch an ad to receive another hint should you need one.

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