no problem i saw that answer late too; developers time gives the player three stars with golden color frame, its a need for %100 i guess (because it has an achievement) examples for lost in london and lost in space: but i couldn't achieve that for lost in underground
To be honest, I never tried to do 100% in this specific game so I have no idea how to get that achievement too. But I guess it's one of those things that is almost impossible to obtain but still doable so the only piece of advice that I could give is try and try.
There is a possibility that you could get the developer time achievement in level 3, just check out the WR and do that but with a bit more efficiency I guess. I currently don't have the resource and time to test things so I'm really sorry if I couldn't give you any useful tip.
actually you helped, i will try to grind level 3 tomorrow. but i still wonder if there is a developers time in 16th level. in farmageddon party edition's steam page i found this: https://steamcommunity.com/app/259810/discussions/0/540734423763172800/ i couldn't open the chinese website though and i don't have an idea about if that page has the way in it or not. and thanks a lot.