I had the right idea on my first attempt, but missed an obvious feature of the level that caused me to be 2-off. After exhausting other options I realized what I had missed, and found the solution. Taught me to look closely at the levels I do.
(13 years ago) Good tutorial ! :)
Took me 7 tries, after continuously doing about last 10 or so levels, in the order given (and also repeating some of them, 3 or more times, trying different orders or tactics to make me understand that sometimes there are SEVERAL ways, equally efficient ...).
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EDIT: Adding 5 stars, for another great example of what was explained in the previous levels!
Always 4 off... I feel like I'd really learn something from solving this, but I just can't get it!
EDIT- 14 years later, I have indeed learned something :)
