1up!

Effects

• Gives Isaac an extra life. Upon death, he will respawn in the most recent non-hostile room with full health, after which 1up! will disappear.
  • If Isaac has no Red Heart Containers, he'll respawn with a Half Soul Heart instead.
• The 1up! mushroom begins following Isaac like a familiar upon pickup, but doesn't do anything. It disappears when its life is used up.
• (Added in Afterbirth) This item belongs to the Fun Guy set. Collecting three items from this set will transform Isaac into a walking mushroom.

Notes

• Resurrection items activate in a set order. 1up! is (Removed in Repentance) 1st / (Added in Repentance) 2nd in this order after (Soul of Lazarus) Soul of Lazarus.
• (???) ??? / (Added in Repentance) (Tainted ???) Tainted ??? / (Tainted Bethany) Tainted Bethany / (Tainted Forgotten) Tainted Forgotten will each respawn with 3 Soul Hearts.
• (Added in Afterbirth †) (The Forgotten) The Forgotten will respawn with 3 filled Bone Hearts (notably more than his starting total) and The Soul with whatever Soul and Black Hearts he had on death.
  • Dying as The Soul respawns him with a Half Soul Heart and The Forgotten with whatever Bone Hearts he had on death.
• (Added in Repentance) (Dark Judas) Dark Judas / (Tainted Judas) Tainted Judas will respawn with 2 Black Hearts.