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eLook
http://www.elook.org/games/cheats/gbc/602.shtml
Quick summary of codes and cheats. [Game Boy Color]
GameSpot - NBA Hoopz
http://www.gamespot.com/ps2/sports/nbahoopz/
Review with screen shots, news, movies, and cheats [scores 5.7/10].
Neoseeker's NBA Hoopz Resources
http://www.neoseeker.com/Games/Products/PS2/nba_hoopz/nba_hoopz_cheats.html
Cheats, reviews, screenshots, and discussion board.