Hyruleslink
Smash Journeyman
Beware when creating custom stages. When you connect two pieces, whether drawing free-hand or utilizing the grid, depending where on the map you are editing many times the two pieces will not fully connect leaving a tiny gap. Normally, characters cannot pass through these gaps but sometimes something happens that makes you fall through them. This can happen vertically and horizontally. Not sure about diagonally, but probably still an issue. The best way to counter this issue is by overlapping any connecting pieces. Unfortunately there is no way to make one piece the dominant piece that is on top. Seems to determine which goes on top at random, so you may have to play around with it for awhile. Hope this helps others out.