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Press the Windows logo key 
+PrtScn. The file is saved to the Screenshots folder in your Pictures folder. You can also us the Snipping Tool which is available in all versions of Windows Vista, 7, and 8 except the Starter and Basic editions.
To take a screenshot with your Mac, Command + Shift + 3 and then release all keys to captuer the whole screen, or press Command + Shift + 4 and press down and drag the mouse over the area you'd like to capture.
To take a screenshot with your iPhone or iPod Touch, press and hold the sleep/wake button and then click the Home button.
Take a Screenshot with Android 4.0 (Ice Cream Sandwich) just press and hold the Volume Down and Power buttons at the same time.
Can you make the screen yellow in all 50 levels?
Each level has its own logic.
Do you need help? Use the light bulb button that will appear after a while in the bottom right of each level to get a hint. There are multiple hints for each level.
With the premium unlock in-app you will not get ads before the hints.
Enjoy!
@BartBonte
Bug fixes and performance improvements.
It looks like you are using an ad blocker. We understand, who doesn't? But without advertising income, we can't keep making this site awesome.
