Slight decrease of graphics quality in some areas, few locations are very hard to find, even after using hints. Food chain puzzle is example how puzzles must not to be made, it is illogical and item on one tile is unrecognizable (i never figured out what it is); ferry puzzle was glitched and was marked as solved before it was actually solved; mineral balancing is not puzzle but red herring. Looks like it is made fast and bit disorganized ways. Not the best one in the series.