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How? A lot of room or witchcraft?

WITCH!

No, just 3 roooms... 
Basically, filled the jumper maze with the patterns tiles, then made a few items which are painted solid and mask the pattern below. As you go over the item you collect it and reveal the pattern below! Does it make sense?

That's a clever way to reveal the designs hiding below.  Really nice pixel designs too, got me in a festive mood.