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Why the fuck Knuckles needs stupid lame mech when he can hop in cool 31100 Sports Car that's just as red but infinitely more badass? Not to mention he can now actually throw hands himself when some asshole in the traffic causes him to throw a road rage fit. Also he could take that bad bat bitch with big fat tats on a ride. Seriously, LEGO, you make Rouge minifigure, but she doesn't come with boobs piece? Wasted opportunity right there.
31100 is cool little set, even though front of the car is the most pretty and detailed part but it doesn't look very good from the side. Airplane alt build is cute. 31124 super robot set still remains as best among small (~150 pcs) Creator 3-in-1 sets.
Also, post 3-in-1 sets, in which alt builds are just as good as the main one.