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Mystery Sack

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Item icon
Item altar
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Beggar Beggar
Secret Room Secret Room
Treasure Room Treasure Room
Golden Chest Golden Chest
Greed mode only Treasure Room Treasure Room
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Added in Afterbirth(page 3, column 6, row 2)
Removed in Afterbirth(page 3, column 6, row 7)
 
Mystery Sack Defeat The Lamb as EdenMystery SackMystery Sack

Mystery Sack is an unlockable passive item.

Effects[edit | edit source]

  • Spawns a familiar that follows Isaac around and has a chance to drop a heart, coin, bomb, or key (or any of their variations) after clearing a room.

Synergies[edit | edit source]

  • BFFS! BFFS!BFFS! Icon.pngIncreases the size and damage of familiars.: Familiar is bigger and increased chances for drops.

In-game Footage[edit | edit source]

Trivia[edit | edit source]

  • Prior to patch 1.04, this item did not drop any items, or do anything at all.

Seeds[edit | edit source]

 PC  A3ES 1TQN (First floor, Treasure room next to spawn)

 PC  QHKQ ZE4N (First floor, Treasure room next to spawn)

 PS4  CGVC XKY3 (Play as Isaac, and reroll the first item in the secret room just below the starting room)

 Vita  Q73A BMMP (adjacent to starting room)

 Switch  Greed mode only 3CAR V7Z0 (First Golden Treasure Room)


Eden  Unlocks Eden Unlocks Eden  Unlocks
Added in Afterbirth Added in Afterbirth †
Blank CardBlank CardDefeat Isaac as EdenBook of SecretsBook of SecretsDefeat Satan as EdenMysterious PaperMysterious PaperBeat ??? as EdenMystery SackMystery SackDefeat The Lamb as EdenUndefinedUndefinedComplete the Boss Rush as EdenGlitch BabyGlitch BabyDefeat Mom's Heart on hard mode as Eden Eden's BlessingEden's BlessingDefeat Hush as EdenGB BugGB BugDefeat Ultra Greed as EdenYellow BabyYellow BabyDefeat Mega Satan as EdenCracked BabyCracked BabyEarn all hard mode completion marks as Eden Eden's SoulEden's SoulDefeat Delirium as EdenMetronomeMetronomeDefeat Ultra Greedier as Eden
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