NHL Breakaway '98
At the Main Menu press C-left, C-right, C-left, C-right, R, R
At the Team Selection screen, press C-up, L, and C-left. Between The Mighty Ducks and The Controller pack team should be three new teams (New York, Salt Lake, and Ports Unknown). These teams are better than any other team.
Go to Create Player and enter the name grEEn jeLLo (case sensitive) for a 300 lb. monster player.
At the Main Menu for the Season mode you can get 100 more bonus points if you press C-left, C-left, C-right, C-right, C-left, C-left, C-right, C-right, R, R
Go to the "Create A Player" option. Then enter the name "Jim Jung". You should be able to change your player's attributes and still have a perfect player. This also works on prospect players, plus you can up them to 100 in every attribute.
Thanks to Revolution readers Tyler Bettles, Shoe, Buff Daddy, N64 Gamer, C.J.L., Gene, Lord of Darkness, Alex Mazzonne, Matthew Peters and Devin Ernst!