The Binding of Isaac Wiki
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1UP is a passive item.

A green mushroom with pale yellow spots.

Effects

Upon death, the player will respawn in the previous room with full HP, at the cost of using up the 1UP. 

It is possible to find the 1UP multiple times in the same run, although this is rare.

Notes

  • If you have collected 1UP and Ankh and die, only 1UP will trigger. The ankh will only trigger if you die a second time (provided you do not have another 1UP).
  • If you collect 1UP while respawned as ??? using the Ankh, if you die you will respawn with no hearts shown on the screen and will only have one hearts worth of health before dying.
  • If you have collected 1UP and Dead Cat, you will have 10 lives. Isaac, however, will always be reanimated with only 1 heart health in total, unless the 1UP was obtained afterwards.
  • Sister Maggy or Little Steve will turn into Brother Bobby until exiting the room.
  • Having a 1UP while doing a deal with the Devil that will kill Isaac, or dying at any other time when you have no normal Heart Containers, results in Isaac respawning with zero Heart Containers, unless Dead Cat was bought before.

Trivia

  • The 1UP's appearance and name is a reference to a Nintendo's popular franchise, Super Mario Bros. where a green, dotted mushroom would give the player an extra life if earned. 

Bugs

  • Dying as you defeat a boss can provide you with both the item you earned and an opportunity to fight the boss a second time, earning a second item. This no longer works in v1.666.
Items
Passive Items
The Sad OnionThe Inner EyeSpoon BenderMax's HeadMy ReflectionNumber OneBlood of the MartyrBrother BobbySkatoleCube of Meat


Halo Of Flies1UPMagic MushroomThe VirusRoid RageLess Than ThreeRaw LiverSkeleton KeyA DollarA Quarter


Boom!TranscendenceThe CompassLunchDinnerDessertBreakfastRotten MeatWooden SpoonPHD


The BeltMom's UnderwearMom's HeelsMom's LipstickWire Coat HangerRosaryXRay VisionLucky FootCupid's ArrowSteven


PentagramDr. FetusMagnetoTreasure MapMom's EyeDistant AdmirationWiggle WormThe LadderCharm Of The VampireThe Mark


The BatterySteam SaleSister MaggyTechnologyChocolate MilkGrowth HormonesMini MushroomThe PactDead CatLord Of The Pit


Loki's HornsLittle ChubbySpider's BiteSmall RockSpelunker HatSuper BandageSack Of PenniesRobo-BabyLittle C.H.A.D.The Relic


Little GishLittle SteveThe HaloThe Common ColdThe ParasiteMr. MegaThe WaferMoney Equals PowerMom's ContactsGuardian Angel


Demon BabyMom's KnifeOuija Board9 VoltDead BirdBrimstoneBlood BagOdd Mushroom (Thin)Odd Mushroom (Large)Whore Of Babylon


Bobby-BombForever AloneBucket Of LardBomb BagA Lump of Coal


Wrath of the Lamb DLC.png


Guppy's TailStigmataMom's PurseBob's CursePageant BoyScapularSpeed BallBum FriendInfestationIPECAC


Tough LoveThe MulliganTechnology 2Mutant SpiderChemical PeelThe PeeperHabitBloody LustSpirit Of The NightAnkh


Celtic CrossGhost BabyCat-O-Nine-TailsHarlequin BabyEpic FetusPolyphemusDaddy LonglegsSacrificial DaggerMitreRainbow Baby


Stem CellsHoly WaterFateThe Black BeanSacred HeartTooth PicksHoly GrailDead DoveGuppy's Hair BallAbel


SMB Super Fan!Pyro3 Dollar BillMEAT!Magic 8 BallMom's Coin PurseSqueezyJesus JuiceBox
Activated Items
The BibleThe Book of BelialThe NecronomiconThe PoopMr. BoomTammy's HeadMom's BraKamikazeMom's PadBob's Rotten Head


Teleport!My Little UnicornYum HeartDoctor's RemoteShoop Da Whoop!Book Of RevelationsLemon MishapBook of ShadowsAnarchist CookbookThe Hourglass


The NailWe Need To Go Deeper!Deck of CardsMonstro's ToothThe GamekidThe Book Of SinMom's Bottle of PillsThe DiceThe Pinking ShearsThe Bean


Monster ManuelDead Sea ScrollsRazor BladeForget Me NowA Pony


Wrath of the Lamb DLC.png


Guppy's PawIV BagBest FriendRemote DetonatorGuppy's HeadPrayer CardNotched AxeCrystal BallCrack The SkyThe Candle


D20Spider ButtDad's KeyPortable SlotWhite PonyBlood RightsTelepathy for Dummies
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