Score status screen
Press Start on controller one to pause the game. Then, press Square(2x's), Down(2x's), Up(2x's) on controller two.

Alternate costumes
Finish the game to access Rin's costume and Ayame's original costume from Tenchu 3: Wrath Of Heaven.

Obtain 1,600 scrolls to access Ayame's original costumes from Tenchu: Stealth Assassins and Tenchu 2: Birth Of The Assassins.

Alternate intermission sequence
Just hold L2 while your watching an intermission sequence from the "Encyclopedia" screen to see Ayame or Rin with their armor.

Tutorial as Ayame
Just hold L1 and select the "Tutorial" option.

Red Blade (Pit Fight) mode
Finish the game within the normal difficulty setting.

Ninja Rebirth
Finish the training level.

Ayame's Sleeping Gas
Finish Chapter 12-1 or 12-2 with a "Grandmaster" rank in Level Select mode.

Rin's Decoy Whistle
Finish Chapter 11 with an "Assassin" rank in Level Select mode.

Rin's Demon Claws weapon
In Chapter 8 of story mode, cross the bridge then go left along the wall. Double jump over to the outcropping/ledge to find it.

Rin's Fire Spell
Finish Chapter 9 with a "Assassin" rank in Level Select mode.

Unlockable Special Weapons
These two weapons can be available by first finding them while in Story Mode. There is one weapon for each character. Once you have the weapons and finish the missions they will be available in your Item Selection Screen.

Ayame's Dokuto Blades weapon
While in Chapter 7.1 or 7.2 of story mode, reach the room across from the Boss battle room. Note: Do not use any shortcut, or this room will be sealed.

Ayame's Fake Rat
Finish Chapter 10-1 or 10-2 with a "Grandmaster" rank in Level Select mode.

Special abilities
Collect the listed number of scrolls in story mode to access the matching special ability.

Arrow Block: 250 (Ayame) or 30 (Rin)
Cheetah Sprint: 150 (Ayame)
Crescent Moon: 30 (Ayame)
Crimson: 200 (Rin)
Crimson Final: 550 (Rin)
Death Drop: 60 (Rin)
False Wall: 500 (Ayame)
Fang Guard: 10 (Rin)
Hawk Eye: 60 (Ayame) or 150 (Rin)
Inner Ear: 200 (Ayame)
Long Claw: 300 (Ayame) or 350 (Rin)
Mimicry: 500 (Rin)
Mind Control: 400 (Ayame)
Numbing Strike: 250 (Rin)
Shadow: 300 (Rin)
Sniper: 350 (Ayame) or 450 (Rin)
Spider's Nest: 450 (Ayame) or 400 (Rin)
Swift Guard: 100 (Ayame)
Wall Run: 10 (Ayame) or 100 (Rin)
Wrath: 550 (Ayame)

Special story mode missions
Allow the events below to happen during story mode to access the matching special mission.

Mission 10.1 (Flames of Passion): Allow the samurai to live at the beginning of Mission 9.

Mission 10.2 (Flames of Sorrow): Kill all three enemies at the start of Mission 9.

Mission 12.1 (Tenchu Kurenai): Kill Ranzo.

Mission 12.2 (Tenchu Kurenai): Allow Ranzo to escape.

Mission 2.1 (Departures): Do not kill all the enemies in Mission 1.

Mission 2.2 (Determination Kill): Kill all the enemies in Mission 1.

Mission 6.1 (The Blind Masseuse): Allow at least one enemy to spot you in Mission 5.

Mission 6.2 (What Lurks in the Shadow): Do not get spotted in Mission 5.

Mission 7.1 (A Sister's Promise): Get the map in Mission 6.

Mission 7.2 (For Whom the Bell Tolls): Leave the map in Mission 6.

Hints & Tips

See spells during intermission sequences
Simply equip a spell like Invisibility or Chameleon before you go into the area where the intermission sequence starts.

Double stealth kills
It may seem as there are only two double stealth kills, there are three X2 stealth kills on the ground and two in the air.

Collect more scrolls
Just use the "Easy kills" trick with the Ninja Mind Control technique. Remain at the limit of the kill range. Your kill range indicator must be off, but if you walk a short distance forward (R1 or R2 + Up), your kill range indicator goes on. Then, press Forward + Attack (Up + Square). If you press Attack as the same time when the kill range indicator turns on, you will execute a super "stealth kill". It is the same as the normal stealth kill but a golden Kanji symbol will appear around your radar, the animation will be longer, and you will receive one more scroll for each enemy killed with normal stealth kill, and two more scrolls for each enemy killed using double stealth kill. This is not that easy to learn, but once you learn it you can start to collect more scrolls.

Easier kills
Possess the Ninja Mind Control technique and either Rin's Shadow technique available. With Ayame, have the Mind Control and either Chameleon or Invisibility. When your playing, just have the Shadow with Rin or the Chameleon or Invisibility with Ayame. Approach kill range and press Circle. They will not be able to move, but if you happen to bump them, the Mind Control will wear off. Make sure to remain a fair distance from them until you are ready to kill them. You could go through the whole stage and paralyze all enemies then just leave them or kill them in any way you like.