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..The Pc Game ..Manhattan Missions ..came out about the same time as TMNT III ,Casey is in this game and you do fight Triceratons.. so..
.. the TMNT Genesis Games are gems..

..you already know you fight a Triceraton in this one..
..

.. and you knew a Triceraton is a boss in this one..
..maybe more Triceratons will show up in the new sequal..