NHL 97 

Write WAGD (use <shift> for uppercase) to use the following keys:

H Hometeam scores
V Guests scores
P Period ends
O Extra playing-time
I A player gets and injuri
F Fight
1 2 Minutes out
2 4 Minues out
4 5 Minutes out
5 Penalty

For NHL 97 if you hit WAGD then type it 30 times your players become small and during the credits if you hit PIONEER during each screen or two screens you will get two new teams.