Ans. Tap all the numbers in descending order in limited time.
Ans. For 4 x 4 grid you can do 2 wrong taps, 3rd will be game over.
Ans. Tap on timer to restart it.
Ans. Tap on highest score to share it.
Ans. Check if you are signed in or not. Set "Let others see your game activity" to "Checked" in Google Play Games.
Ans. Sorry, you currently can't access these. This feature will be added in upcoming versions.