| I thought this|
was supposed to be
A sandbox is an area where you are free to edit to experiment, explore the wonders of wiki formatting, and to work on drafts of articles.
There is a sandbox at RationalWiki:Sandbox which everybody can edit. It's fine for trying out things quickly, but no use if you want to save your work.
Everybody can create their own sandbox in their own user space. You can create it at "User:yourname/Sandbox". You can have subpages of this too.