American Gladiators

Start at Level 3 with 10 lives 
When the game is just starting, go to password, and press A, B, B, A, B, it'll take you to level 3, with 10 men. 

Start at higher levels 
Press Start to pick one or two players. Move the cursor to the "Password" option and press A and B in the following sequences to skip to higher levels: 

Level 2: A, B, A, A, A, A, B, B 
Level 3: A, B, A, A, B, A, A, A 
Level 4: A, B, A, A, B, B, B, B 
Level 4 with 10 Lives: A, B, A, B, B, B, B, B 

After you've entered the correct sequence, move the cursor back up to "Start" and press Start to begin.