Re: sims won't go upstairs
Looking at the pics, it doesn't look like anything is wrong. But here is something to try. Delete the one wall section on the left where the stair goes down beneath it to see if that is causing the route fail. There may not be enough head room there. You might have to move the wall one tile to the left and make a sort of bump out there.
If that doesn't work, please upload the lot to the gallery or direct us to where we can download it as @PipMenace asks and someone here will take a look at it.
Hope this helps.
