According to the CV of an animator who also worked on FFXV, Sony heard your cries for a new Crash Bandicoot and thought, let's make Knack tack do some stacks.
Because, y'know, one uninspired and underwhelming 'adventure' of combat arenas and pressing square a lot wasn't enough.
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Wasnt the first knack just a "punch punch hook" game no real combos and actually recieved terribly by most people because of its difficulty for a game aimed towards children