Arknights Wiki
CN Phantom & Crimson Solitaire banner.png

Integrated Strategies #2: Phantom & Crimson Solitaire, often simply known as Integrated Strategies 2 (IS2) or Phantom and Crimson Solitaire (Crimson Solitaire or PCS for short), is the second season of the namesake roguelike game mode in Arknights.

Crimson Solitaire introduces new mechanics that becomes the future standard of I.S., notably the fact that the game mode is now permanently available, as opposed to the first tentative iteration of I.S. in Ceobe's Fungimist which lasted three weeks.

In August 2, 2022, an official website of Phantom & Crimson Solitaire in the Global server is introduced.

Release date
CN January 5, 2022 ~ September 1, 2022
Expansion I: April 1, 2022
Expansion II: June 15 ~ 16, 2022
Global July 14, 2022 ~ March 1, 2023
Expansion I: October 1, 2022
Expansion II: December 15 ~ 16, 2022




Difficulty levels

Castle Sightseeing
"Silent Squad" will escort you the whole way
  • Starts with Silent Squad.png "Silent Squad" (friendly HP +45% and ATK/DEF +35%).
  • Halved rewards.
  • Progressions in this mode do not contribute for unlocking new Collectibles and Squads.
Formal Investigation Hopefully this will turn out to be an uneventful investigation
Calamity Faceoff
Nothing but hardships ahead
  • 20% more rewards.
  • Starts with a Collectible and one of the six "cursed" Collectibles listed below, both of which are selected at random:


Beneath the darkening sky, you find yourself lost in a fog-shrouded forest.
You are in desperate need of safe shelter to pass the night,
and it appears that the ominous castle ahead is your only choice.
—Main menu text
Chapter Flavor texts
Mist-stricken Missteps
There is fog covering the entire area, and our squad has lost our way. Are we pushing forward, or are we merely dissolving ourselves away?
The mist has completely overwhelmed you. There is no longer a need to seek a way out, for this has become your home.
Sunset Courtyard
The courtyard is filled with the sunset's afterglow, yet that is not the color of hope. Come in, come in, esteemed guests who have wandered astray. The castle welcomes you.
The castle has numerous trials in store for its visitors, and you are unable to pay the price of failure.
Homeland Remnants
As the mist spreads into the castle and the vines make their way up the columns, the dark night appears to have retreated elsewhere for the moment. Do remember as you enjoy this moment of respite, however, that darkness is always right around the corner.
As you succumb to the dark shadows, you too will become part of the history of this place.
Nightmare's Prelude
Darkness falls, the candles throughout the deserted castle begin to light up by themselves, and the silent Nightzmora begins to roam the shadows in search for prey who have lost their way.
The candle flames flicker ceaselessly, just as you yet remain in this old castle. You surrender to your endless nightmares, never to awaken again.
Blood-soaked Corridor
Blood moons often signify the beginning of unfortunate tragedies in written accounts, and this omen is now shining down upon us through the windowpanes that line the corridor.
What will emerge beneath the blood moon? Panic? Fear? Frantic wailing? So be it. You have experienced it all.
Hall of Desires
The purest and truest desires, standing above all time, have engulfed this space whole. Here, there is nothing but the endless thirst for aesthetics, fine arts, and perfection.
Too bad. You are not entirely unblemished.

Chapter VI is only accessible by clearing Chapter V while having Abrupt Realization.png Abrupt Realization.

Command EXP rates

Chapter (Emergency) Operation Dreadful Foe
I 10 (12) N/A
II 12 (18)
III 16 (24) 32
IV 20 (30) N/A
V 25 (38) 50[note1 1]
VI 45[note1 2] [note1 3]
  1. Only if the player fulfills the condition to progress into Chapter VI, as the Dreadful Foe in Chapter V ends the run when cleared otherwise.
  2. There are no normal Operation(s) in Chapter VI.
  3. The Dreadful Foe in Chapter VI ends the run when cleared.
Operation EXP
Duck Lord's Play 3
Duck Lord's Party 6
Gopnik's Fist 7
This Ursus Man 9
Accident, A Date With Slugs, Beast Taming, or Gun Salute[note2 1] 12
Demonic Cage 24
Disorderly Banquet 32
"Knights' Duel" 40
  1. If forced into by the "Sleeping Statue" Encounter.


When a Crimson Solitaire run ends, the ending will be shown if the run is completed; if the run fails, the "Reverberation" message is shown instead.

Afterwards, the credits (which can be skipped) will roll, showing the player's nickname under the title "Blood Diamond" and lists their actions in each Chapter they have entered throughout the run.

Credited actions
You stepped into the ancient castle and participated in a {difficulty}
You selected the {initial Rec. Vouchers option} recruitment set
Recruited Operator {name}
Recruited Promoted Operator {name}
Recruited Support Operator {name}
Recruited Temporary Operator {name}
Recruited Monthly Squad Operator {name}
You entered the {Chapter title} zone
You experienced the hallucination {name}
You perfectly cleared {(Emergency) Operation title}
You encountered {boss name}
You met {Encounter/Downtime Recreation}
You met the odd merchant Cannot
You opened {Collectible from Boons}
You defeated {boss name}
Cleared the {title} ending
Obtained support {?}
Promoted Operator {name}
Unexpectedly encountered {ISW-DU/ISW-SP Operation title}
Received Collectible {name}
Received Play {name}
Received Tactical Prop {name}
Carried out {option} in the Safe House
Spent {amount} Originium Ingots to purchase {ware}
Invested {amount} times
Received {withdrawal}

Once the credit ends with the message "The End", the following summary of the run will be shown:

Dr. (nickname)
for a duration of
xx hrs xx min xx sec
yyyy/mm/dd hrs:min:sec
/ending your journey at

In addition, the following will also be displayed:

  • A flavor text that varies depending on the run's outcome, after the summary above.
  • A list of Collectibles, Plays, and Tactical Props the player have obtained during the run.
  • A list of Operators the player have recruited and promoted during the run.


Floors cleared
  • Clear Chapter I: 30
  • Clear Chapter II: 80
  • Clear Chapter III: 150
  • Clear Chapter IV: 270
  • Clear Chapter V: 400
  • Clear Chapter VI: 550
Steps taken 1 × (no. of nodes entered)
Normal battles fought 10 × (no. of Operations cleared)
Operators recruited 2 × (no. of Operators recruited)
Items obtained 5 × (no. of Collectibles (including Plays and Tactical Props) obtained)
Boss battles fought 30 × (no. of Dreadful Foes cleared)
Elite battles fought 20 × (no. of Emergency Operations cleared)


Expansion I

Crimson Exhibition

The Crimson Exhibition allows the player to view the content of Crimson Solitaire they have unlocked thus far. It is divided into five sections:

  1. Communication Recorder: A log of Crimson Solitaire Monthly Squads' conversations.
  2. Past Performances: A gallery of Crimson Solitaire artworks.
  3. Phonograph Collection: A jukebox of Crimson Solitaire soundtracks.
  4. Longevity Box: A list of Crimson Solitaire Collectibles. Collectibles that are not yet unlocked will be named "???" instead until the condition is met, at which their name is revealed but their picture will only be revealed when they are actually obtained in-game.
  5. Loose-Leaf Repertoire: A list of Crimson Solitaire Plays the player have obtained.
  6. Tactical Prop: A list of Crimson Solitaire Tactical Props the player have obtained.

Changelog (Global)

  • July 14, 2022 Introduced.
  • August 1, 2022 
  • September 1, 2022 
  • October 1, 2022: Expansion I 
    • Castle Notes level cap raised to 95 with Focus as the special reward.
    • New Monthly Squad: "Big Bang".
    • Deep Investigations introduced.
  • November 1, 2022 
  • December 1, 2022 
    • Castle Notes level cap raised to 125 with "Last Word" as the special reward.
    • New Monthly Squad: "Till the Spring Comes".
  • December 15 ~ 16, 2022: Expansion II 
    • Theatrical Rehearsal introduced to Crimson Exhibition.
    • Dialogues for Pith, Sharp, Stormeye, and Touch added.
    • New secret ending: Silent Chapter.
    • 8 new operations (5 ISW-NO, 2 ISW-SP, and 1 ISW-DF).
    • 2 new Encounters.
    • 25 new Collectibles.
  • January 1, 2023 
    • Castle Notes level cap raised to 140 with a mysterious special reward ("Ruins" main menu theme).
    • New Monthly Squad: "Today's Afternoon Tea".
  • February 1, 2023: FINAL UPDATE 
    • Castle Notes level cap raised to 155.
    • New Monthly Squad: "Temporary Partnership".