Flow (something that I will have to talk about sooner or later), Strand is a refreshingly new take on the "connect the dots" genre.
Actually, Flow is a bad example. Among the well known logic puzzle, Strand is probably more akin to Hashi; but again, it's only a surface similarity. Strand is just an original game that stands on its own.
The goal is to connect dots. But this is not done by painting lines of arbitrary shape, like in Flow; what you do is pull rubber bands from one dot to another. The striking thing when you start to play the game is how tactile it is: the rubber bands deform as you make them longer, you can almost feel them. This is what touch screens are made for.
Dots can be connected multiple times: each dot contains a number, telling how many times you must use it. The important rule is that the rubber bands cannot cross (or overlap) each other.
Also, there can be black walls that prevent making a straight connection between certain dots.
You cannot, however, connect a dot to itself, not even using pegs.
The other important gameplay element is colors. Generally, the dots in a puzzle will have multiple colors, and you can only connect dots of the same color. However, a dot doen't necessarily have a single color. In the example below, two of the dots have two colors. This means that they can be connected to dots of both colors.
The puzzles are varied because they mix geometric constraints and visual intuition with more abstract graph connectivity problems. For example this puzzle has no walls or pegs, so it's all about the dot colors and how to connect the right ones using only straight lines.
There's even one in-app purchase just to customise the colors, which frankly I find excessive. You can also buy solutions–but of course we don't need them, do we?
The free puzzles are mostly aimed at casual players, and I found them to be easily solved just by experimenting, without much thought.
The ones in the hard pack are more challenging; to give you an idea, here is the first one:
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