Step 3: Laying out the Mines (i.e. soda caps)
You don't need to use too many - my hallmates and I just used one or two caps per room with ant problems. Don't spread them out all over the floor - you'll just step on them.
When you're done filling up the number of caps you need, place them somewhere on the floor, but out of the way (obviously in a room with ants). WE put ours in room corners, behind table legs, etc.