Level Differences
The even-numbered levels where the player controls a paint roller are somewhat more difficult, because the paint roller cannot move too far from grid rectangles that have already been filled without running out of paint and having to return to completed parts of the map to refresh its supply. When this happens, any painted lines which are not part of a filled rectangle will vanish and must be painted again. In practical terms, this means that the player must build their completed squares around the starting point of the level (which always has a fresh supply of paint) and spread outwards, rather than completing squares in any part of the game board they please, as they can on the odd-numbered levels. This also makes filling the corner rectangles and becoming invincible much more difficult.
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