It would be 5 stars... But since they switched ad services to Vungle, they show unskippable 20-30 second ads. IT'S MICROSOFT. THEY SHOULDN'T NEED THOSE KIND OF ADS. I was OK with 5-10 second waits here and there, but unskippable 20-30 sec ads are totally inadmissible for a MICROSOFT app/game. Also, thanks to those ads, I'll never play Blockudoku, Fishtopia, and the rest of the games shown in those unskippable ads.