Microsoft has apparently told a group of journalists that you're going to require a fair bit of space for its Project Natal to work properly.
To be specific, you're looking at needing an area of at least 4 metres (13 feet) between you and the TV for it all to work smoothly, which will be quite a large space for many homes.
Kotaku has noted that the space may be too big for many Japanese homes, but British gamers could well suffer from the same problem.
The Beeb found that the UK builds the smallest homes in Europe, with the average room just 15.8 square metres – which works out at less than 4m x 4m. And that's without furniture.
A good guesstimate as to whether you've got the space is whether you can take 4 strides between your sofa and your TV, where the Natal sensor will sit.
Will this give Sony's PS3 Move a bit of an edge over the full-body Natal gaming experience? We're chasing Microsoft for a comment on this, but let us know your thoughts below.