A complete reference for The Binding of Isaac: Four Souls card game.
Masquerade
Isaac finds himself caught amongst a swirling, twirling mass, surrounded on all sides by unknown assailants. Orchestrating this, hidden deep within the pulsating crowd, is the Mask of Infamy. Your only chance of escape is to find the Mask and bring the revelry to an end – easier said than done when you can barely even tell friend from foe…
The challenge is won when Anoymous Mask of Infamy dies.
Setup
Choose a difficulty level for the challenge: Normal Hard Ultra Hard
Set up as normal for solitaire/co-op mode.
Place Anoymous Mask of Infamy face up to one side of the monster slots in a final boss slot. (feel free to use your regular Mask of Infamy card as a stand-in to represent this!)
Global Modifiers
Mistaken Identity Each time a player declares an attack, before they choose what to attack, they roll- 1-2: They must attack the monster deck. 3-4: They must attack a random monster in a monster slot or minion slot. 5-6: They may choose what they attack.
Mistaken Identity Each time a player declares an attack, before they choose what to attack, they roll- 1-2: They must attack the monster deck. 3-4: They must attack a random monster in a monster slot or minion slot. 5-6: They must attack the final boss.
Mistaken Identity Each time a player declares an attack, before they choose what to attack, they roll- 1: They must attack another player. That player has 4+. 2: They must attack the monster deck. 3-4: They must attack a random monster in a monster slot or minion slot. 5-6: They must attack the final boss.
Crowded Out While monsters are at 1, they have +2.
Reminder
Remember that the specific rules and global modifiers for this challenge are used in addition to the general challenge rules that apply to all challenges. The general challenge rules can be downloaded separately from maestromedia.com.
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Game Modes
Normal
If you would declare an attack on Anonymous Mask of Infamy, instead roll-
If the result plus the number of souls controlled by all players is less than or equal to 8, put the top card of the monster deck in a minion slot and make an attack against it. Otherwise, make an attack against Anonymous Mask of Infamy.
Anonymous Mask of Infamy has +1 for each minion in play.
Hard
If you would declare an attack on Anonymous Mask of Infamy, instead roll-
If the result plus the number of souls controlled by all players is less than or equal to 10, put the top card of the monster deck in a minion slot and make an attack against it. Otherwise, make an attack against Anonymous Mask of Infamy.
Anonymous Mask of Infamy has +1 for each minion in play.
Ultra Hard
If you would declare an attack on Anonymous Mask of Infamy, instead roll-
If the result plus the number of souls controlled by all players is less than or equal to 12, put the top card of the monster deck in a minion slot and make an attack against it. Otherwise, make an attack against Anonymous Mask of Infamy.
Anonymous Mask of Infamy has +1 for each minion in play.
Competitive Variant
This challenge is primarily designed for solo and co-op mode, but you can also play a game of regular competitive Four Souls with an added twist.
Setup as normal for a competitive game. Place Anonymous Mask of Infamy face up to one side of the monster slots in a final boss slot (use the competitive variant version of Anonymous Mask of Infamy).
Anonymous Mask of Infamy only looks at the number of souls controlled by the attacking player, rather than all players, in the competitive variant. The other change is that rather than going into minion slots, monsters go into crowd slots.
Crowd Slots are a new type of slot specific to this challenge. They broadly work the same way as minion slots (e.g. they are also temporary). The difference is that each player has their own personal crowd slots, and players may only attack monsters in their own crowd slots. They can be thought of as minion slots that are only active on the turn of that specific player.
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FAQ
I’ve been told I must attack the final boss, do I then need to roll for its ability? Yep! If you are instructed to attack the final boss by the global modifier Mistaken Identity, then you will first have to roll – if you roll below the number needed for the difficulty you have chosen, you lose the Anonymous Mask of Infamy in the crowd and will have to attack a new minion instead of being able to attack the final boss.
I’ve been told to attack another player but I’m playing solo, what do I do? Remember the general challenge rules here – for the sake of targeting and abilities (like that of the global modifier Mistaken Identity in this case) each character is considered a separate player when playing solo.