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Remember you sometimes have to pick floor tiles to drop them on another place, just like the 1st level. In fact I'll get rid of this on future versions because it's a useless complication to the game, but anyway, here's the solution:

got it and after stuck on level 3 :( i managed from time to time to mix blue and yellow but didn't get the logic...Anyway hard to leave this cute game ! with some basic sound maybe even harder to stop playing!