You can place blocks on non-delta squares. After you delete it and go into delta again the spot that you placed the block in is now a delta-square
WORD KEY:
non-delta square: a spot where you can't place or delete tiles.
delta square: a spot where you can place or delete tiles.
(Sorry if this makes no sense, there's no easy way to explain it without bending some sense)
(Only in delta negate Zones)






