A decade ago I could buy entertaining games like this. No ads, no timer, pure joy, a deserved mental health break from the stress of life.
I got stuck early on at one level for a couple of days. When I found the solution, I couldn't believe how easy it was! Now on level 29. I very much enjoy the challenge. Even when I have reached the 30, the top level, it's a game I can either reset or just pickup and play any level when the mood strikes me. Very much worth the $2 investment. Some levels are easy and some are quite challenging.