|Beautiful variations: ChooChooLoops|
Here are some special solutions found by Yonah Borns-Weil, whose homeschool library includes a large supply of our gamepuzzles. Check these out, from left to right: a) the quads form a single snake, with 4 O's in the corners; b) a diagonal row of 5 O's; c) maximum color separation; d) 5 loops and full symmetry.
Our favorite 12 shapes of five units joined can all be modeled as loops that enclose 5 islands in different ways. Here are the loops. Solutions we leave for the puzzlers to find, using all the pieces.
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