Binding of Isaac: Rebirth Wiki
Binding of Isaac: Rebirth Wiki
Character Isaac appearance.png
Full red heartFull red heartFull red heart
Table dividing line 1.png
Challenge Number
Available Rooms
Item Pool Treasure Room.png: no          Item Pool Shop.png: yes
Boss ??? portrait.png
Unlock Method

PONG Defeat Isaac 5 times

Added in Afterbirth †

Pong is Challenge #35. Isaac starts off with Rubber Cement Rubber Cement and Cupid's Arrow Cupid's Arrow. Damage is fixed at 100 and tear delay is fixed at 0.20 . The goal is to defeat ??? in Chest Chest.


The high starting Damage makes this run fairly easy, although keep in mind that with the high tear-delay, tears can only be fired once every 5 seconds.

Make sure to pick The Polaroid The Polaroid after the fight against Mom.


  • Keeping Cupid's Arrow in mind, try to hit as many enemies with the initial shot as possible since while the tear is midair Isaac cannot shoot any more tears until the cooldown is up.
  • Before entering the next room, make sure that the current tear is no longer flying, since Isaac may not be able to shoot a tear upon entering a new room.
  • There is not a need to take any damage ups, so if given the choice, pick speed or Health ups.
  • All items that generate flies are extremely useful, due to fixed high damage.
  • Removed in Repentance Sacrifice Rooms can be used to skip to the Dark Room Dark Room. Beating The Lamb there will count as clearing the challenge.
  • Thanks to the huge damage stat, Isaac can easily reach Boss Rush if reached in time. But while Boss Rush can provide extremely beneficial items, most bosses won't die in a single hit (and damage cannot be increased to one-shot them), resulting in Isaac having to avoid several attacks to fire the next tear. It may be better to skip the Boss Rush to avoid taking unnecessary damage.
  • Luring enemies into the bouncing tear may be a viable strategy, especially if it is stuck somewhere.
    • Purposely making the tear stuck (e.g. by shooting it against a wall directly, making it bounce back and forth) might be viable situationally (e.g. Larry Jr. or any fight, where the boss is stationary, especially when this stationary enemy is in the center of the room.

Good items[]

  • Shoop Da Whoop! Shoop Da Whoop! is a valuable item since its damage scales with Isaac's damage, one-shotting most bosses.
  • Bob's Rotten Head Bob's Rotten Head is also a very strong item because the poison effect deals triple Isaac's damage.
  • Rotten Baby Rotten Baby's blue attack flies give Isaac a more consistent means of dealing damage.
  • Tammy's Head Tammy's Head, Tear Detonator Tear Detonator, and Sad Bombs Sad Bombs are very valuable as the storm of giant bouncing tears can clear any room (even bosses) in a few seconds.
  • Mutant Spider Mutant Spider and The Inner Eye The Inner Eye also provide a big help since tear delay is fixed.
  • Libra Libra is a very valuable item, as it will balance all stats out, even the stats fixed by the challenge, giving Isaac very high and balanced stats, making the challenge effectively trivial.
  • Fate's Reward Fate's Reward will fire the same high-damage tears at a faster rate than Isaac.
    • Similarly, Incubus Incubus is a very powerful item as it fires an exact copy of the tear essentially doubling the already high damage. Combine this with BFFS! BFFS! for that tear to become even larger.
  • Chocolate Milk Chocolate Milk is an extremely powerful item that will allow Isaac to quickly fire small but powerful tears, or charge up to fire a room size tear that will rapidly bounce off all enemies in the room.
  • Technology 2 Technology 2 will allow Isaac to fire a very high damage laser without the drawback of the low tear rate.
  • Removed in RepentanceSuccubus Succubus is an extremely potent room clearer, since it scales with Isaac's damage.
  • Varicose Veins Varicose Veins helps when getting hit, as it will trigger the Tammy's Head effect each time.
  • Finger! Finger! scales with the high starting damage, making this item a perfect primary weapon.
  • Ouroboros Worm Ouroboros Worm can make this run trivial as the tear's high speed and travel rate can have it cover the entire room before it bursts.
  • Items that give flies or spiders like Guppy's Head Guppy's Head or Box of Spiders Box of Spiders will be able to near-instantly kill bosses and clear rooms very fast, as flies do two times Isaac's damage.
  • Tear Detonator Tear Detonator Causes tears to split into six tears, which allows most rooms to be cleared easily.
  • Eye of Belial Eye of Belial grants homing and piercing tears after hitting one enemy.
  • Multidimensional Baby Multidimensional Baby doubles tears, which can clear rooms very easily.
  • Godhead Godhead will cover a large portion of the room with its damaging aura. When combined with another item like Ouroboros Worm Ouroboros Worm that speeds up the tear, the entire room may be cleared immediately.
  • Maw of the Void Maw of the Void can eliminate entire rooms in one go if the circle attack is charged.
  • The Boomerang The Boomerang will deal double Isaac's damage, for a total of 300 damage, and it recharges in 4 seconds.
  • Magic Fingers Magic Fingers can clear rooms in one go, as it scales with Isaac's damage.
    • Added in Repentance Magic Fingers no longer scales with the full damage, being fairly mediocre.
  • Toxic Shock Toxic Shock allows Isaac to clear most rooms upon entering them, as it will deal double Isaac's damage (for 200 in total) to every enemy in the room upon entering.
  • Pupula Duplex Pupula Duplex Isaac's tears become a huge arc covering more than half of the width of a typical room allowing for an easy run while one-shotting bosses.
  • The Parasite The Parasite Isaac's tears split into smaller ball-shaped tears upon hitting enemies, causing the room to quickly fill with bouncing tear shots that can quickly clear a room.
  • Sacred Heart Sacred Heart and Spoon Bender Spoon Bender grant homing, which causes Isaac's tears to hunt down nearby enemies or linger around bosses instead of ricocheting randomly. Telepathy for Dummies Telepathy for Dummies also provides the same benefit, albeit temporarily.
  • Scorpio Scorpio and The Common Cold The Common Cold are powerful as the poison damage is double Isaac's damage.
  • Spear of Destiny Spear of Destiny deals twice Isaac's damage per tick, defeating enemies and even bosses incredibly easily.
  • Added in RepentanceSharp Key Sharp Key is very good since it scales with your damage and has no cool down. It will take about 6 keys to kill ??? with this Item.
  • Added in RepentanceEye Drops Eye Drops allows you to stagger your shots, meaning you can fire more often and sometimes simply fire two shots at once.
  • Added in RepentanceEye of the Occult Eye of the Occult allows you to control your tears making hitting enemies more reliable.
  • Added in RepentanceNotched Axe Notched Axe swings scale with your damage without any delay, making it a surprisingly good weapon.
  • Added in RepentanceSpirit Sword Spirit Sword swings ignore tear delay, making the challenge a joke.
  • Added in RepentanceCircle of Protection Circle of Protection is very effective, as its contact damage and deflected tears scale with Isaac's damage. This is especially useful for clearing stragglers.

Bad items[]

  • Mom's Knife Mom's Knife should be avoided; despite enormous damage, it will take a long time to charge for any meaningful distance, so Isaac will be essentially reduced to melee range.
    • Brimstone Brimstone, Monstro's Lung Monstro's Lung and Tech X Tech X should also be avoided. Although the attack will probably be enough to destroy any enemy or boss, Isaac is defenseless during the lengthy charge time. Removed in RepentanceTech X also loses the benefit of bouncing attacks.
  • Ipecac Ipecac should also be avoided. The tears will not bounce anymore, and due to the great height of the tears, these will pass over the enemies, being very difficult to hit.
  • Technology Technology should also be avoided, as the delay between lasers will become very long, and the lasers do not bounce.
  • The Small Rock The Small Rock and Pentagram Pentagram (if offered by a deal with the Devil) should be avoided; the former will only lower Isaac's speed while the latter will only result in a loss of a Heart container(s).
  • Proptosis Proptosis Will lower damage as the tear travels, without any plus to damage.
  • Added in RepentanceConsolation Prize Consolation Prize Since your lowest stat will, most likely, be Tear Delay and that stat is fixed, there will be no stat change. Will still drop coins/bombs/keys like normal.


  • Items that increase damage or tears won't affect Isaac's stats.
  • Items that adjust tear range will cause tears to be recalculated: more range means slower fire rate, and vice versa.
  • Defeating Delirium will also clear the challenge.



  • The challenge's name is a reference to the game Pong.