The transition to the ART (Android Runtime) environment (initially optional) significantly improved app launching speeds and overall fluidity.
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KitKat introduced a feature that hid the status and navigation bars, allowing games to use the full screen for the first time. The transition to the ART (Android Runtime) environment
This was the first version to allow games to go truly full-screen, hiding the status and navigation bars with a swipe. this was a visual mosaic game.
Every Android version has a hidden "Easter Egg." For KitKat, this was a visual mosaic game.