Sorry for my English, I'm Hungarian.
Please use 1.12.X Version!
After you loaded the map hit "Esc" then click "Open to Lan" then set "Allow Cheats" to "On" then click "Start LAN World"
You need to do this or you can't finish the last level! If you find any bug please tell me. This is my 2nd Ten Ways To Die map.
Thank You very much for downloading and playing my map! 
If You like my map please let me know, and I make more!
Have a very nice day!
Multiplayer Support = Yes!