It's probably older than the sun, but...
 

www.try2hack.nl

It's good fun, right up until the point where you need Visual Basic 3. Level 5, that is.

Most people don't like clicking links until they know exactly what's on the other side (unless there's a possibility of it being porn).

I've gotten higher than that in the older version way back when. You don't *need*VB for level 5 but it's not to have...;-)

Thanks for the link to the new stuff anyways.