This kind of game has been around for quite a while. It's a match-the-pairs game, where matching tiles must be joined by a path of no more than three line segments. My wife was playing one that kept interrupting the game play with ads. The ads didn't seem to bother her but they drove me crazy, so I wrote Three Line Puzzle to be that game but with no ads.

I've been working on it in parallel with the Ultimate Portfolio project, and that has helped a lot!