SUAAXA          Both players have infinite lives 
PEZELG          Both players have 1 life
PEZELK          Both players have 9 lives 
GZLATG          Player 1 start at last level reached
GZLEPG          Player 2 start at last level reached 
SEZEGG          Give player 2 an advantage 
AEVXLSPT        Enemy easier to shrug off
ZEVXPIGE        Enemy harder to shrug off
LEEXSYPA        Normal enemies do more damage
XYUXEUZK        Knife thrower harder to beat
GZVKIYSA + ATVKYNGG     Don't die when time runs out