What's particularly good:
1. Sometimes the image is on the right, or left or up or down.
2. Multiple colors
3. The skulls - don't count them as part of the original image.
4. Countdown markers: every 5 or 10 seconds, the program will add fake squares to your image.
There's a lot to like about Symmetria: Path to Perfection. We should all be playing games like this to ward off Alzheimer's.