Like the Connect4 game... (Score 3, Interesting)

I wrote a Connect4 game for the iPhone called Touch4 (http://phobos.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=283490535). I did some research on this and the name can be trademarked which is what MAY be the issue here. Like scrabble, the game play for connect four is centuries old and there cannot be infringement on that. My guess is that this is a negotiation tactic my Hasbro. I am watching this one closely. I wanted to name our pong game with Pong in the name but decided not to take the legal risk which is why it's called Touch Tennis (http://phobos.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=284442084). I think the other games with Pong in the name are at legal risk. Some of them aren't even pong, but just using "Pong" to get hits.