Sorry, that can be a bit disconcerting until you get used to it.
A lot of the walls here at TT Games are made from LEGO bricks - so we'll often smash straight through and rebuild them behind us.
We've been here for 10 years, and we're still inventing new shortcuts. Hold on tight! Full speed ahead!
And now: welcome to the Design floor.
This is where all our games start out, as rough sketches, heated arguments and endless endless lists.
Look over there, in the corner! Can you see Jimmy, Lead Designer on LEGO Lord of the Rings, slumped over his desk? That game's finally finished, so Jimmy gets to go to sleep for a while.
A very little while.
He'll be back in action shortly, don't worry. But for now, let's not disturb his Mithril dreams.
I'd like to introduce you to the LEGO City: Undercover design team - but they're working in secret high up in that giant LEGO treehouse, placing the last round of collectibles in the game. No-one's allowed up until they're finished; the location of those final hidden Gold Bricks must remain closely guarded until the game's actually in the hands of players.
You should meet our other active team, though. Please, step out of the vehicle and follow me. Over here, just behind the life-size LEGO statues of LEGO Harry Potter, LEGO Ron Weasley and - for some reason - a six foot tall LEGO carrot. If we approach quietly, you might be able to catch them at work...
Yes, I know it looks like they're just playing with LEGO; but they're actually designing levels for a brand new game. And if you look closer, you'll notice that the minifigures are... yes, that's right.
I know - awesome, isn't it?
Yes, of course. And many more.
Anyway. Let's get back into the transport, and move on to the next floor.
Ah. Sorry. That wasn't a LEGO wall. Are you OK?
Phew. It'll take a while to rebuild that transport, though.
No matter. To the stairs!