This thread has been retired due to the large number of posts. The newest sandbox can be found here:
Spoiler warning: Be aware that this page contains a lot of MathJax, so it will probably need quite a while to load completely.
User of the old sandbox will have noticed that with the amount of answers gathered there, it is very hard on your computer to get past the posts to the answer field. (Even deleting answers would not solve this problem for 10k users.)
Here you have a new playground... have fun.
(Use this for testing stuff instead of bumping random posts to the mainspace a million times.)
Before you delete a post here, please reduce it to one line without MathJax.
Old formatting sandboxes: