it's supposed to be a level about pathfinding, not about clearing as many blocks of colors you don't care about as you can in order to have some trivial large chain.
Yes, I thought so, and I tried that approach first
I wasn't trying to get an excessively long chain; I just couldn't see a victory chain right off the bat. My solution? Focus on clearing one or two colours and check each turn until a long chain appears. The result? I kept accidentally setting off chains that caused even more unintended chains due to the large play field and high # of white blocks. Which put me back at square 1, so I just kept on trying.
I think what this level needs is a limit on the number of moves. Not limited to 1 move, since there's not ALWAYS a 20-chain right off the bat (but there usually is), but a few moves (maybe 3) so you can still make a 20-chain possible if it's not already there without letting people spend forever trying to set it up in this wrong way.
That would be a good hint, yes.
@keith:
So true! That would've helped on this level. I got more practice at it in some later levels. In retrospect, I think I should have stuck to small chains of 3 and controlled them until a chain of 20 appeared after a few turns.