NOTE: Not 100% sure, but this may be a Japanese version of "Resident Evil: Deadly Silence".
Unlock Masters of Knifing
Beat the game once to unlock the 5 level mini game Masters of Knifing.
Unlock Wesker in wireless mode
Get a Rank B in Masters of Knifing.
Unlock Barry for wireless mode
Beat the game with Jill once
Unlock Enrico Marini
Clear all Co-op levels in Wireless Play.
Unlock Forest Speyer
Complete Classic Mode as Jill.
Unlock Rocket Launcher in maingame
Beat any scenario in under 3 hours to gain the Rocket Launcher for your next run through the game. It'll be in your inventory when you start from your completed save.
Complete Jill Valentine's scenario with Barry Burton alive or Chris Redfield's scenario with Rebecca Chambers alive. Save the game, then load the cleared game file to start with the Special Key in your inventory. Use it to unlock the closet in Mansion 1F to access the alternate costumes. Note: The alternate costumes are different in Classic and Rebirth modes.
Unlockable Multiplayer Characters:
1. Barry Burton: Complete Rebirth Mode as Jill.
2. Rebecca Chambers: Complete Rebirth Mode as Chris.
3. Kenneth J. Sullivan: Complete Classic Mode as Chris.
4. Enrico Marini: Clear all Co-op levels in Wireless Play.
5. Richard Aiken: Clear all Versus Mode levels in Wireless Play.
6. Wesker: Get a Rank B in Masters of Knifing and beat all 5 levels
Unlock easy mode
When starting a new game hold the control Pad right for about 3 seconds, the text should now turn green, and there is easy mode unlocked.
Leave Jill alone until she enters her inactive animation (hand-on-hip pose). Get your stylus and give her a tap in the chest area, or if she's facing away from the camera, tap her behind. Marvel at the bonus animated resposes.
Leave Chris alone until he enters his inactive animation Get your stylus and give him a tap in face/hair, or if he's facing away from the camera, tap her behind. Marvel at the bonus animated response.
Spew in THEIR face. (Rebirth)
Doesn't it get annoying when those pesky Spew Zombies get you and it's hard to retaliate before they hit you? Their is an easy way to prevent this: When they spew blow into the mic an it'll hit them instead. This is EXTREMELY helpful to get a highscore in Masters of Knifing.