Hi Cryotechnic
Remove your start marker and any characters from your map and add up to 8 multiplayer starters ( the blue ones )
Select multiplayer from the top of the editor ( Blue one beside launch ) ...once loaded select " Host a game " select your map and that's it ...
Either wait for people to join or try it out .....
Multiplayer runs through steam so make sure your logged in to your account ...
Any other questions please ask ..
The only person ever to get all his work done by "Friday" was Robinson Crusoe..
