Almost perfect
It seems the game is designed to ensure that there's always a solution to place the 3 tiles provided on each turn, however there's a catch: from time to time one runs into a series of tiles that can't do the job, and it's a pity one has to restart from scratch after 20,000 points. It's unnerving when it happens 3 times in a row! Seems like a bug that should be easy to fix.