ilo 2012-05-20 09:15
I guessed I was supposed to create flows between the plus and minuses of matching colour.
If that's what you were going for, it could work, but it needs something extra for it to work as a puzzle. Obviously you'll have your own ideas, but a few things spring to mind, like limiting moves/block placement, coloured tiles permitting same coloured flows to pass while blocking others, coloured metal blocks that disappear only when the corresponding coloured plus and minus are connected, having the player lose when the wrong plus and minuses connect.