Tricky Circles by Dmitry Chalovskiy is one of such games.
Dots, but thankfully it's something completely different.
The tutorial isn't great in explaining what you have to do, so it took me a couple of attempts to get it.
So in the example above, you start from the left circle. It is a 1, so you move right by one position. That's a 2, so you then move right by two positions and land on the rightmost 1. Now you move left by one position and you're done. Note that it's legal to go back in the direction where you came from.
Also, you must draw the path with a single gesture. If you lift your finger and haven't solved the puzzle, you must restart from the beginning.
Mathematically, these puzzles are equivalent to searching for a Hamiltonian path in a directed graph.
I quickly solved the first few puzzles, and then got stuck on puzzle 8.
SPOILER WARNING: skip the next paragraph if you want to solve the puzzle by yourself.
In another puzzle I found a circle that didn't lead anywhere, so it had to be the end of the path.
In general, the solving process reminds me of Disctrail, but here you have less freedom.
There are 21 free puzzles, which must be completed in sequence. With an in-app purchase you can buy 21 more puzzles, which again must be completed in sequence.
These puzzles are harder than they might seem. Definitely give this game a try.
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