Good but...
I found in the game tents that a key piece of instruction was not given. They do say that each tree must have at least one tent touching, but they do not say that each tree must have only one dedicated tent attached to it. Two tents can be touching a tree, but there must be a second tree that the other tent is attached to. I found this tip on another site, which made a huge difference in solving the puzzles. Otherwise, very good app!
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100 Logic Games - Time Killers, v1.39.3