On Uncharted Ground

Edit: My original post seems to have disappeared into the ether. I suspect user error.

Since the release of 3rd Edition, I have run two large D&D campaigns, not including the current one. The first came to an end with the characters at 9th level (they might have reached 10th by the end of the last adventure - we never counted up the XP). The second came to an end with a total party kill at 10th level.

The current campaign has reached 11th level, and is still going strong. It came as something of a shock to me at the weekend when I realised that this is now the highest-level campaign I've run under the current rules-set.

I think I'm starting to get vertigo...