Everybody knows Knack is where it's at nowadays and the biggest thing ever, why stop at Knack 2 when you could have;
Knack Kart, Knack Party, Paper Knack, Super Knack Bros., Knack 3(D Land), Super Knack 64 and Yoshi's New Knack?
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But seriously, I'd say Knack 2 because the game-type actually has potential.