Source keeper wierd
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In Room E5S5 there are 2 source Keepers at (7,35) source. It is funny that lower source keeper doesn't go to it's (10,38) source, but spends 1/6 of its life to go around to (7,35) source.
Is your algorithm checking for first source found starting from upper left corner of 5x5 box? I'd suggest to do extra check for shortest path between sources if multiple found or search in spiral starting from middle.