Only got to level 2. Fun concept but extremely finicky in object placement. took about 5 times to get one row in line without any gaps despite being all but on the previous row. also lots of ads- I got 1 after finishing the 1st level, and 2 separate ones part way through the 2nd. the one thing I can't stand is ads in the middle of playing. if it was between levels it would be less annoying and more understandable, but it interrupts game play