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Batman Vengeance
http://www.geocities.com/BatmanVengeancePS2/
Cheats, controls, moves, and hidden extras.
Cheat Code Central
http://www.cheatcc.com/psx2/batmanv.html
Contains cheats and strategy guide.
Lunabean.com
http://www.lunabean.com/sony/ps2_bv.html
Hints, tips, cheats, codes, and message boards.