Did they have a floor?

Yes, but you should be careful when polishing ceramic tile floors because they can become slippery. You can buy a floor polisher from sites like Amazon or rent them from Lowe's or The Home Depot.

Is kinda like a court but its all white ecept for the lines....

Floors are for walking on, supporting other structures, pretty basic stuff. Dirt is and was likely the first flooring material, probably stone(s) came next. Floor coverings do just that, they cover...

If you are asking about the correct gradient. It is 1:40 (meters)

a floor