Please read the F.A.Q. It is unknown if it will be possible to add it in the final version with every other remaining addition, within engine's technical limitations.

pleas hide and seek keys knifes and six leggs and marblrs in full facility pls

Take a look to the "Suggestions, Requests & Planned features" discussion, as you can see what is planned for the future updates.

yo Oliver cant you just make another map for hide and seek?

This can be a solution if it cannot be added in the final version yes, I keep the idea