Number One

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Item icon
Item altar
 
Table dividing line 1.png
 
5.100.6
 
Character appearance
 
Tear appearance
Table dividing line 2.png
 
Treasure Room Treasure Room
Greed mode only Treasure Room Treasure Room
Table dividing line 3.png
 
Added in Afterbirth(page 1, column 6, row 1)
Removed in Afterbirth(page 1, column 6, row 1)

Number One is a passive item.

Effects[edit | edit source]

  • +1.5 tears.
  • -17.62 range.
  • +0.76 tear height.
  • Tears turn yellow and are fired from Isaac's lower body rather than his head.

Synergies[edit | edit source]

  • Brimstone Brimstone: The laser turns yellow and charges at a much faster rate with no decrease to the range.
  • Epic Fetus Epic Fetus: Increases fire-rate with no decrease in range. Explosive clouds are now yellow.
  • Added in AfterbirthIncubus Incubus: The Incubus fires at a much faster rate with no decrease to the range.
  • Ipecac Ipecac: Increase fire rate moderately and decreases range only slightly.
  • The Ludovico Technique The Ludovico Technique: Turns tear yellow and allows it to be moved much faster.
  • Added in Afterbirth †Pop! Pop!: Eyeball tears are yellow, can be fired much quicker, and does not affect their airtime.
  • Technology Technology: The laser turns yellow and Technology's firing rate is greatly increased with no decrease to the range.
  • Added in AfterbirthTech X Tech X: Laser turns yellow, charge time is greatly decreased, and no decrease to the range.
  • Tiny Planet Tiny Planet: Tears travel roughly the same distance but can be fired much quicker.

Interactions[edit | edit source]

  • Azazel: Lowers range, reduces charge time.
  • Added in Afterbirth †Compound Fracture Compound Fracture/ The Parasite The Parasite: Tears often disappear before being able to split. Split tears also only travel a very short distance.
  • Cricket's Body Cricket's Body: Tears disappear very quickly after being fired and split tears barely travel at all.
  • Dr. Fetus Dr. Fetus: Not recommended. Bombs do not travel far, making self-damage very likely.
  • Added in Afterbirth †Haemolacria Haemolacria: Does not affect the main tear; however, burst tears travel significantly less far.
  • Added in AfterbirthKidney Stone Kidney Stone: Number One's range penalty overrides Kidney Stone's. The stone is not affected by short range, otherwise the combo behaves as expected.
  • A Lump of Coal A Lump of Coal: Tears still increase in size and damage as they travel; however, the short-ranged distance limits tear size and damage.
  • Added in AfterbirthMarked Marked: Tears become orange. The firing rate is increased, Marked's effect is unaffected but the range is reduced.
  • Mom's Knife Mom's Knife: The knife turns yellow and the maximum range is significantly reduced.
  • Monstro's Lung Monstro's Lung/Added in Afterbirth †Lead Pencil Lead Pencil: Not recommended. Tear barrage disappears very close to Isaac.
  • Proptosis Proptosis: Not recommended. Tears disappear after traveling a very short distance.
  • Rubber Cement Rubber Cement: Tears often disappear before being able to bounce off walls.
  • Toothpicks Toothpicks: Tears become orange.

In-game Footage[edit | edit source]

Trivia[edit | edit source]

  • "Number One" is a euphemism for urination.
  • In the original Binding of Isaac, Number One had the effect of turning all future Range Down pills into Range Up pills. This was presumably designed to reduce the risk of players being stuck in situations where their range would become too low to clear certain rooms. However, in Rebirth, Number One no longer has this effect, and will not turn Range Down pills into Range Up pills.
  • This item is used in Challenge #2 (High Brow).
  • Removed in Afterbirth † The firing animation of Number One is a little different from what it looks like in the original Binding of Isaac.

Seeds[edit | edit source]

 PC  J172 PRAK (Treasure room adjacent to spawn)

 PC  VMA3 SMZA (Treasure room adjacent to spawn)

 PC  Added in Afterbirth SRX8 FXHM (Treasure room adjacent to spawn) (XL floor) (Hard mode only)

 3DS  0RJ7 VQYY (First floor treasure room)

 PS4  WYH4 A4DX (First floor treasure room)


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