Guys, pardon if you have already seen this in another forum, but I wanted to get as many opinions as I could. I am the developer of the game TanZen, which is a tangram game with a zen garden theme. My game has been on the App Store for nine months. Here is a screenshot of my game: Now, I've had a competitor on the App Store for the last few months. They make a game called Tangram Puzzle Pro. The visual interfaces are not similar, except for the fact that he borrowed my use of a selection ring to rotate the shapes. I'm fine with that, as other games use rings to rotate/manipulate game objects. However, checking their website today, they are now selling a PC game, called Tangram Puzzle Pro: Secret Garden. They have a playable demo, and here is a screenshot: They're using a sand motif, and green pieces, which is very similar to my motif. Now, I don't know if that is grounds for copyright infringement, but what I do know is the way they've presented the pieces is entirely based on my design. I spent a couple days coming up with that layout, and all they've done is flip them. I feel they are now in violation of my game's copyright. But before I send them a friendly email to modify their game, I wanted to get some opinions from fellow developers. So your opinions on this would be very much appreciated. Thanks!