First Launch the game

Then go to Options

and then click on Password

You may then enter a password from below

Chapter I: Learning to be Bad

#1 FIRST
#2 MS-DOIS
#3 MICROWAVING
#4 QUATRILHO
#5 SUPERGLUE
#6 BROKENBONE
#7 FLYINGRAT
#8 DANIELSAN
#9 FOOTBALL
#10 JEBUSRAT
#11 DEADCAT

Chapter II: Being a Bad Rat

#1 BOMBIT
#2 MUTANT
#3 ANTARTIDA
#4 SKATING
#5 TRICOLOR
#6 BLUEBALLON
#7 EVEL
#8 GOODTIMES
#9 SUPERTONE
#10 MICKEYMOUSE
#11 JERRY&TOM

Chapter III: Cats' Hell

#1 ACDC
#2 SHORTCUT
#3 BLUESKY
#4 PENDULUM
#5 BEATLES
#6 SNOOKER
#7 HONORABLE
#8 RATSLIFE
#9 OZZYRAT
#10 XIXO
#11 TIRIRICA

Chapter IV: Bad Rat P.h.D.

#1 OUTSIDE
#2 MADAGASCAR
#3 PARADISE
#4 WETCAT
#5 BRASIL
#6 DINOSAUR
#7 GREMIO
#8 LOBOBRANCO
#9 TARANTINO
#10 TORDESILHAS
#11 NEWTON