@sarahholdenriedHoly moly, when I made this reply, my other one, I did not see any of the other replies at all, there was only 2 showing, just 2! Just refreshed and saw there's 12. What is going on here?
My loading is being a pain is what.
But seriously, I had made a room, but it was longer than I needed. In my Sims 3 brain, I go to click to delete. Nope. That's why I then tried holding down ctrl and drag the tiles I wanted gone but again, nope. That deleted all the tiles. So then I resized the room, but the tiles I wanted gone, stayed, floating. Bizarre. But after that I was able to use sledge hammer to delete them. However, now I hope I dont have to run into an issue where I need just one tile removed. It's a shame just using the sledge hammer alone can't remove a single floor tile like how it's been for Sim 1-3.