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Challenge number
Isaac App.png
Full red heartFull red heartFull red heart
Available rooms
Item Pool Treasure Room.png: no          Item Pool Shop.png: yes
Boss Mom's Heart.png / Boss It Lives.png
Rune of Berkano Rune of BerkanoRune of BerkanoComplete challenge #20
Unlocked by
Purist Defeat Mom for the first timePuristPurist

Purist is challenge #20. This challenge is unique because you start with no items. Your goal is to defeat Mom's Heart or It Lives. This Challenge is unlocked when you defeat Mom for the first time.

Difficulty[edit | edit source]

Because there are no Treasure Rooms, it is harder to find items. While this is standard for most challenges, you also don't start with any items.

Strategy[edit | edit source]

  • Other Special Rooms become much more important.
  • Bombs are much more valuable when hunting for Secret Rooms as these can provide free items.
  • Curse Rooms guarantee damage and can lower the chances of Devil Rooms. However, if you have a full Soul Heart or Black Heart, the reward can outweigh the damage and still allow you to access a Devil Room. Alternatively, you may wait to enter the Curse Room until after visiting the Devil Room.
  • The Bible The BibleThe Bible Icon.png6 roomsUpon activation, Isaac gains flight, allowing him to pass over all obstacles in the current room. Instantly kills Mom, Mom's Heart, and It Lives when activated, but will kill Isaac when activated while fighting Satan. can be used to instantly win the boss fights against Mom, which can be used to preserve key health, and Mom's Heart/It Lives, which will complete the challenge.

Reward[edit | edit source]

MainPageChallenges.png Challenges MainPageChallenges.png

1. Pitch Black 2. High Brow 3. Head Trauma 4. Darkness Falls 5. The Tank 6. Solar System 7. Suicide King 8. Cat Got Your Tongue
9. Demo Man 10. Cursed! 11. Glass Cannon 12. When Life Gives You Lemons 13. Beans! 14. It's in the Cards 15. Slow Roll 16. Computer Savvy
17. Waka Waka 18. The Host 19. The Family Man 20. Purist
21. XXXXXXXXL 22. SPEED! 23. Blue Bomber 24. PAY TO PLAY 25. Have a Heart 26. I RULE! 27. BRAINS! 28. PRIDE DAY!
29. Onan's Streak 30. The Guardian
Afterbirth †
31. Backasswards 32. Aprils Fool 33. Pokey Mans 34. Ultra Hard 35. Pong
The Binding of Isaac: Rebirth The Binding of Isaac: Rebirth The Binding of Isaac: Rebirth
MainPageAchievements.png Achievements MainPageAttributes.png Attributes MainPageBosses.png Bosses TarotCard.png Cards and Runes MainPageChallenges.png Challenges MainPageChapters.png Chapters
Isaac App.png Characters MainPageBabies.png Co-op MainPageItems Small.png Items Item Pools Item Pools MainPageMonsters.png Monsters MainPageObjects.png Objects
Red heart.png Pickups BlueBlue.png Pills MainPageRooms.png Rooms MainPageSeeds2.png Seeds Guppy App.png Transformations The Left Hand Icon.png Trinkets