yeah I feel that. I finished a playthrough didn't get a single route Idk what I'm doing wrong honestly, I just want Kevins route or David, Thomas is the one I'm least interested in and I cant even do his route properly hah
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Managed to finish Kevin's route, here's some tips: just choose the blunt choices. At some point you'll see him at the gym, at the stock room (underground floor with the gate), at the comfort room, cubicles and his room (102).
On your first day off, don't accept Thomas' invitation, fix the car, choose Thomas, then call Kevin. First s*x scene should be in the Camping trip.
Hi no problem! You can ask me anything. I answered "yes" to all his "you like what you see?" And I also went with Thomas to dinner ever night. I don't think the dinner thing affects the other routes. (Around Day 14 or 15 there's one scene during dinner time that revolves around Kevin. I think it's vital for the route's progression too. Choose "prank" to do this) Make sure to save every time a dialogue with Kevin comes up. Dialogues seem to play a huge part in the route's progress.
Also I remember answering both the "I think you're cold" and "I don't know" in the shower scene in two separate playthroughs and it both worked. But make sure to save this one in case the other doesn't actually work, good luck!
So Kevin's route is complex, basically on any day where you don't have an interaction with him just go to bed, this makes triggering the truck repair easier. You have to never apologise in any interaction with him, constantly be upfront with your attraction to him and visit the city instead of the river on the day when you encounter him moving boxes so that you have a third dialogue option on that day. The route has a lot of failure points so if you get to a critical point (fixing the car, shower conversation, camp) and it works save!
In brief: Always go to dinner
Early on know what days you encounter him and on days you don't go to sleep instead of exploring but after the camping trip you can probably stop this.
On day 1 he's patrolling the wall tell him you can't sleep and then say well ok
When he argues with his girlfriend say they woke you up and then go to talk to Norman (should make Kevin fix the car)
On day 8 he's in the bathroom
On day 10 he's on the toilet say what the and then confront him for having the door unlocked (should unlock shower conversation on day 12)
On day 12 he's in the shower say I don't know
On day 13 go to the city instead of the river then talk to him at the locked gate downstairs from the cafeteria
On day 15 do the prank then that night go talk to him in his room and say yes
On day 40 he's in the recreation room opposite the cafeteria (easy to miss him because that room is not normally open)
On day 56 go to the city (easy to miss)
So I've been trying this for a while now as well, even made notes of when Kevin appears to not waste time on certain days. I have all of the locations you mentioned and done all blunt answers along with the fixing car and the prank thing. I have yet to unlock his route... the only thing I see in your post that I don't know about is the "comfort room". Would you mind telling me where that is because I swore I went through this map and never found such a room. Unless I have it under a different name in my notes, also my notes only go up to day 18 since that's when the first scene should start but I never unlocked it so I always restart.