It copies other players' movements and translating it to you.


How to play with friend or nofriend in singleplayer?
1. Download not popular map.
2. Download 3 addons: Map, Mingebags (Incredibly smart) and gm_construct 13 beta.
3. Make sure you have turned on network.
4. Launch map.
5. Friend launch map.
6. Spawn traffic thing orange with whute lines for killing mingebags ( you can to not doing it)
7. and your friend or notfriend can spawn it (he can to don't doing it.
8. Wait.
9. gg.
10. Now you can play with your friend or nofriend in singleplayer.
11. MAKE SURE YOU MAKE 1, 2, 3, 4, 5, 8. STEPS
12. idk to write
13. unlucky number to finish the instruction
14. ok thx for reading this I hope I helped to you.

I aslo think you and your friend needed steam version of gmod. not pirate.