[SuperSajuuk]

Sheffiled might be cheaper?

Didn't the original though have most the games set up throughout the episode - this looks like a blank floor so if they're setting up each round as they film them then the recording are going to be very lengthy.

Cheapness is probably the reason, or maybe they didn't want to go for something too big, get little audience members and lose money from the production.

I grabbed two shots from a Series 2 episode that was on YouTube, and it appears it was one game in the playing arena at a time, but presumably if one of the games was the Wall, another game would have been set up on the main floor itself. Images below