Snapping objects to a grid.

Okay, I saw dennis’s laboratory construction set and I’m making a game that will be based on cuboid sections. In case you don’t feel like taking a look at the file, it is made of several pieces that snap themselves to a grid when you move them. I’ve tried to contact him to ask him how, and he seems to not be there as It’s been 2 weeks. So, does anyone know how to do this?

You can either hold Ctrl while (G) Grabbing, or click the magnet icon on the header. By default it should already be set to increment, but if it’s not, you can change it with the little menu next to the magnet icon.