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There's a huge leap in graphics and animation between World Tour and Revenge. Revenge might even reanimate every move in World Tour while adding many more.
WM2000 introduces CAW system, Expands the number of moves greatly. Adds additional slot for front and back grapples allowing even more moves per character.
No Mercy expands on career move to where every title has branching storylines that you need to play each multiple times to see everything. Adds running grapples, and the sitting and hands/knees states, which their own moves. backstage areas, tables you can break, and two (bad) gimmick matches.
Fuck off you little brat. I dare you to try and talk that shit to my face.