It is a matching game from Bling where you can earn Bling points and exchange it to real Bitcoin.
How to start earning from this app?
You just have to download, register, and play. The app is on playstore, download it then register using your Coinbase email. The game is very easy, you just have to connect similar-colored blocks and complete the challenges for each level. Whether you win or lose, you will still earn Bling points. The maximum points in a day is 1000 points. You will know that you've reached the maximum points for that day when a notification pops up that says you have reached the max points and you have to return to dashboard. You can play again after 24 hours.
The minimum for withdrawal is 1000 Bling points, so you can withdraw instantly to your Coinbase account in a day. However, to make another withdraw, you have to wait for 5 days from your last withdraw so I suggest you increase your earnings first before withdrawing.
In terms of being legit, this app definitely lives to that. However, you cannot earn big from this app. The maximum points of 1000 is only equivalent to 100 satoshis. So this app is just for passing time and not really a passive source of income.