Ingenious (marketed as Kaleidoskop in some countries), but that's a totally different game.
There are six symbols, and 21 domino pieces showing all the possible pairs of symbols.
The playing area is a hexagonal grid, which in each puzzle is populated by a different pattern of symbols. You must place all the 21 pieces on the board, matching the existing symbols. Each puzzle has only one solution.
If you try to drag the piece over the board, which would be the natural thing to do on a touch screen device, you'll be disappointed: that doesn't work. To place the piece, you have to tap one of the highlighted spots.
The way how this has been implemented is confusing, because it seems that you can use only the pieces you can see, even if there would be better moves available. For example, looking at the position above, the double-yellow piece can only go in one place, but it isn't available on the right.
This annoyed me for some time, until I noticed the up and down arrows. Those let you scroll through your pieces. Again, this is not how one would expect things to work on a touch screen. You'd expect to just be able to scroll the list of pieces by swiping over it.
The luxury of having pieces which can go in only one place on the board quickly goes away as the puzzles progress and the layouts get more ambiguous.
Simon Tatham's Portable Puzzle Collection. Unfortunately, that's not possible, so you have to do all logic deductions in your mind.
There's a total of 30 puzzles, which are all playable from the start with no need to unlock them. The last couple of puzzles further increase the difficulty by replacing a few symbols with question marks, so you have to figure out which symbol goes there.
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