Cheat mode:
Press L1 + R1 + L2 + R2 to enter the Easter Egg screen. Then, enter one of the following codes to enable the corresponding cheat effect. Note "_" indicates a space.

Result - Code:

Large team, small team - David_Goliath
Recruit an player - GOLDEN
Same home and visiting teams - Mirror
Stronger defense in simulation mode - BOOST
Switch teams during simulated season - JUMPER
Unlock All-Time teams - GIMME or GREED
View credits - CREDITS
Win all simulated games - SC
Unknown - Double_Wow
All player attributes set to 99 - BEAT_DOWN
Better blocking and tackling game - Da_Wall
Better passing - Pass_Attack
Better players - BUILDER
Better running - Run_Attack
Equal teams - EQUALS
Get all recruits selected in Blue Chip mode - GOLDEN