[Cthulhu_]

The code and look / feel does fall under copyright though, so if it was using the same graphics or it can be proven to be using the same code (or a decompiled version of it), it can be removed under copyright law.

But yeah. This is kinda why people patent stuff, despite the brouhaha about patents: if you don't patent your gameplay idea (in this and similar cases), people will just take your idea, rebrand it and run off with it.

[chrismcb]

Look / feel isn't copyright able either. That is why there are lots of clones. It is a sleazy move to try and co opt the name though