To unlock other difficulty in High tech Coloseum
You first only have a single difficulty mode in High tech Coloseum and there are two more to unlock. Each one have a new final boss (the last one have 3 special boss).
Effect - Code
Medium mode - Finish the easy mode
Hard mode - Finish the medium mode
Helga (Haruka)
Beat Episode: Kakeru.
Jake (Hiroki)
Beat all tournament modes.
Unlock Character Passwords (Chinese Version)
Put these into the password screen of Ape Escape: Million Monkeys (Chinese version) to unlock new characters.
Password - Effect
KAKESARU - Ape costume for Spike
GOODRIVAL - Dark Jake
DARKRIVAL - Dark Specter
NOWMASTER - Legend
MOREMORE - Virus Casi
REDMONKEY - Volcano