[robertmrangel]

I'm in a similar boat.. I'm trying to recreate Squad Leader by Avalon Hill in a browser. I think Hasbro might own the trademark, but I don't think copyright applies to game rules:

http://www.battle-board.com/minisl/

If they send a cease and desist I guess I'll just take it offline. I don't think there are any damages in my case, but I'd still hate to be sued!

[smallblacksun]

The ideas in the rules cannot be copyrighted, but the specific text of the rules can be (see http://www.copyright.gov/fls/fl108.html). Also, game mechanics can be patented.

[Serentiynow]

Yes, I'm afraid game mechanics can be patented. http://en.wikipedia.org/wiki/Crazy_Taxi_(series)#Legalities

The green arrow on top of the screen. http://screenshots.en.sftcdn.net/en/scrn/22000/22606/crazy-t...

[rmc]

Probably not game rules, but be careful with logos (of the game and of game pieces).

[eru]

And careful with the names, too.