Originally Posted by Helios
I should have said that the puzzle should be solved in the procedure that takes the fewest number of moves. Terrace 2 & 5 would never follow each other as moves go.
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I think 2 & 5 being special effectively makes no difference to the shortest solution. Effectively, you just have to solve the puzzle normally, and then subtract the number of moves with 2 & 5 from the total number of moves. For all intents and purposes, it's no more difficult than with 1 special level. However, if you CAN'T infinitely chain the special levels' moves together, it means that there may be some optimization possible by preferring to move one of the special levels "prematurely" so to speak. I'm not sure that's the case, given the limited number of moves at a given time, but it theoretically adds a degree of complexity. Hence, to add a degree of complexity, I'd suggest making #2 and #3 the special levels, and that their moves could not be chained together. But that could add a bit too much difficulty for the level of problem.
DaveE