Runeline is an edge-matching puzzle. Grey Runes can rotate and move. Yellow Runes are fixed, but they can rotate. Blue Runes cannot move or rotate.
(A long time ago, I knew some folks into Runes. They're a set of tiles that have symbols on them. A book came with it and each symbol had some kind of vague adage. A draw bag came with it. The Rune folks always seemed to think that some cosmic force destined them to draw that specific rune from the bag. I didn't get it. Too new-agey for me.)
There are 48 levels. I've solved15 levels and am stuck on level 16 which has 22 tiles. Anatoliy Tsvetkov is the designer. Runeline is a free puzzle app, so definitely give it a chance!