Fantasy Teams
A total of six fantasy teams are available in "Madden NFL 08," including two Hall of Fame teams, but they must be unlocked before you can use them. Unlock them by collecting the matching Madden Card for each team, or simply beat each team in the Fantasy Challenge Mode of "Madden NFL 08." The unlockable teams are the Dummies, Glaciers, Deceivers, Tridents, NFC Hall of Fame and AFC Hall of Fame, all of which can be found in the Supreme League. To make beating these teams easier, you might want to set the difficulty level to "Rookie" before starting the game.
Performance Institute Glitch
"Madden NFL 08" gives players the options of entering the Performance Institute before each game; this will increase your player's statistics and help him reach the rank of superstar even faster. There is an exploit you can take advantage of, however, that permits unlimited training sessions in the Performance Institute before games. After you've completed your first exercise, exit the Performance Institute and view your team schedule. Exit out to the city map, and the Performance Institute will still be available for use. This glitch can be repeated as many times as desired, allowing you to increase your statistics as much you need.
Action Replay Codes
To enable the Action Replay for "Madden NFL 08," you must first enter the master code. The master code is: YKMG-VXTZ-M6WA7 5CBJ-MA7J-N46FA Z0A4-J5G6-MP32K JRMR-288V-9QRMP 2CC5-25EC-EUN6X 4KTM-3GW0-4EH8F BBDD-AU19-JKGWT B4HZ-DXPB-WM5MB 1UQQ-5992-Z5PYE CU6H-7HZZ-Q9PJ8 J0DK-VCU1-N7VGK N1DE-ZQMQ-W10Y7 B5E9-1EYD-99BXH W2CQ-MGVZ-Y74111 BRD-8K5Y-8B4A9 03AH-5PBC-9K2T7 WWT3-ZKKJ-DXJ6
After entering the master code, you can then enter "EH7V-E9WM-FHBEF KM91-X2H8-X2XC2" for infinite tokens. Enter the code "F3HQ-U4B1-HQJAJ" to enable speed modifier cheats, then enter the code "05Z8-0YX3-ZU38G UHNY-JW8C-Q3E7A DK6J-33CM-QBN6X 0EA6-6XH5-4V7H8 7UTU-5602-QZ57T." Now you can press "R3" plus "Right" during game play to enable hyperspeed mode. Enter the code "K1M2-0QNG-29K7X YD4R-0AV3-8MRJ2 EJ6D-HGGY-GXATQ 63W9-4CP1-4MNND V8BM-TYBV-ZBAH6" and then press "R3" plus "Right" to enable slow-motion mode.