CoPaP

In this thread, list one system per post. The world that made the system originally should be the one to post it.

Then list the date that the post was last changed. Re-edit your system post to reflect this.

Give a small description of what the system does.

This is done better on the wiki. See there if you want a list of systems and descriptions.

Feel free to add to these descriptions/directions if you feel you have some info that could help future worlds have an easier time with it.