Welcome to Doctor Mario: Battle Royale edition. That's it. Put pieces in line and rack points.
The idea is simple, but you know, without marketable packs you can't have unwinnable games. You go one on one with another player to pretty much try to win about who is having the biggest number at the end of 5 rounds, 2 moves each rounds ± 1 or 2 moves for each bonus.
The game starts pretty friendly, until it sees you have no Facebook (and so, you have no data to be sold) or you have no money to splurge on the game. There it shows it's true colours.
Rounds become a matter on how long you have till you lose (because you WILL begin to lose a lot) and when you have your victory, the opponent will always show a miracle at hand that will push them over you with a difference of at least 70 points during the last round. Once you reach the 1200 trophies, your free trial of victories has ended, and either you grind (and coins for the power up needed to start the games will dwindle) or you will pay with real money for a preferential treatment.
Soon enough, the game will become a 10 minute a day grind. Free daily packs will be consumed in small victories and bigger losses.