What's happening?

Human eyes can't notice object's slow change. When you looking at image, you can experience change blindness if part of the image changes. What's happening is based on this fact. The rule is very simple. Look at the pictures and find a changing part and then tap it. That's all. You will find murmuring yourself "What's happening?". Have fun!

Features:
- Bewildering but very fun.
- Easy but difficult
- Easy to learn and easier to love.
- 168 photos.
- 3 difficult level: Easy, Normal, Hard.
- Hint is useful to solve a difficult photo.