I have played this game daily for years, recently it stopped giving credit for finished puzzles, then it started freezing on me, usually at the end of a game, but last week it started freezing the screen in the middle of game, a few times I uninstalled and installed it again, but it was still a frozen game and no way to fix it without the developers wanting personal info from me. I always played offline, so there were no ads, but ads would still try to play. Uninstalled for good today.

Game has become bogged down with ads over the years. If you tend to finish levels quickly, you'll spend more time seeing ads than playing the game, as there is an ad following every level, with extremely rare exceptions. As a matter of fact, over half of the ads take so long, it is literally faster to close out the game and reopen it, as there is no option to skip these.

This game was pretty good and very much a good way to train your brain and memory. However, the overabundance of ads have destroyed this game. ads after every puzzle is is ridiculous. it used to not be that way. of course you can pay for the ad firee version. but, the free version is now not worth it