Making props like crates be exactly on the ground.
Did you know that if you ctrl+v paste a prop while your cursor is inside the 3D camera view it will paste the prop on your cursor's position in the game world? It will be pasted exactly just-touching the ground, no need to line them up in 2D view manually - if that's what you're doing, idk.
---
In the past I made a lot of surf maps and a lot of surf maps have mirrored symmetry. Making everything symmetrical to a T takes a while and requires a special OCD! And then transitioning from perfectly mirrored symmetry to asymmetry seems to have been hard for me as most my maps are still symmetrical in some way...
It feels like to me that if you're making an asymmetrical map it becomes more difficult to witness any of your calculated battle scenarios, because they happen half as often, but then I guess that means you have double the potential new battle scenarios.. Interesting thought.
-
Also, I'm pretty ocd about making detail feel just-right. Like if a corner feels too empty, or a door feels oddly too far away from a wall, or a sign is rotated too much, etc.