Is it always possible to eliminate all Geopanels?

Is it always possible to eliminate all Geopanels? - Close-Up Shot of a Gold Medal on a Black Surface

From what I have seen you need the same number of geoblocks as you have different geopanels. N-1 colored blocks (where N is the number of different color panels) and a Null block. I have seen levels with only N-2 blocks (plus the Null block) though. Are they impossible rooms or is there just an alternate solution?






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