Excellent help all round guys, thanks!
@ trevor & tonyw: yes, it's the interactive bit I'm having the trouble with ;) The Guardian one is exactly the model for what I'm thinking of. I've been looking for a solution for a few days now and I think you're probably right about having to pay...and I can't see me doing that!
@ pastille: Bigdave seems to have achieved what I'm after but I assume he's paying for that site, what with it having it's own domain name. I'll get in touch with him and see what he says....thanks :)
The printable pdf route is probably the way I'll end up going, I just thought it would be easier for people to play online rather than having to print things out.
Any further thoughts gratefully received and I'll let you know if I find an answer (that's free)!
Cheers.