there is a check box on the tool bar at the top of wed, to the right of the delete object icon. when it is unchecked snap is off. also the number to the right of that is the grid that is snapped to. sometimes decreasing that number helps. It does seem easier to align things when snap is off but in the long run you may be asking for trouble. You have to zoom in as close as possible when you are aligning your blocks and make sure everything lines up or you will get gaps which leads to things like light leaks and can cause slow framerates because the engine is trying to render those gaps. It is recommended to use the snap feature whenever possible. Maybe you should start a new thread and see how many people have disabled snapping. Maybe someone with more experience can give you advice on snap. I built my first level without snapping to grid and everything came out crooked and the engine kept screaming about leaks and duplicate blocks, there were visible gaps everywhere and of course i used CGS subtract recklessly so I had weird thresholds and holes in the floors. Now I snap everything to grid and make sure everything lines up. its better than going back and trying to realign everything later!