Binding of Isaac: Rebirth Wiki

Added in Afterbirth †

Broken Modem is an unlockable passive item added in The Binding of Isaac: Afterbirth † (Booster Pack #1).


  • Enemies, enemy shots, tears and pickups will briefly freeze in place at random intervals.
    • The frequency of the effect depends on Isaac's luck.
    • Added in Repentance Frozen enemy shots will disappear.
  • Has a 25% chance to double the room drop, similar to Contract From Below Contract From Below.
    • Unlike the Contract, the Broken Modem cannot double chests, pills or cards.
      • However, it can duplicate chests that are an alternate reward from Added in RepentanceOptions? Options?. These chests will have different contents from each other.


  • Added in RepentanceMagneto Magneto + Options? Options?: If Broken Modem duplicates a chest that was spawned by Options?, using Magneto to immediately open the chest while in its glitched form will create a TMTRAINER TMTRAINER item if the chest contained an item.


  • Poke Go Poke Go: The charmed enemies spawned by this item will also be affected by the modem.
  • Contract From Below Contract From Below: Contract from Below spawns two items, Broken Modem has an independent chance to duplicate each one.

In-game Footage[]



  • Broken Modem is based on this Steam Workshop item by freeze.
  • Broken Modem is a reference to an internet Modem/box. because the internet box is broken, It means that there is a large amount of lag, as the client (player) computer is having trouble getting the data from the host server over the stuttering internet. This shows itself in the item through the following effects:
    • The client computer has trouble getting the inputs of other players over the broken internet, meaning the other clients freeze in place and look like they aren't moving, as the computer isn't getting the inputs fast enough to show them. (slows enemies, items, and tears)
    • The client computer gets the host's or other clients' inputs twice, as the client computer can't send the acceptance trigger to the host server fast enough. (double items)


Bug Bug! Added in Repentance If this item is rerolled (D4 D4, etc.) while the freezing effect is taking place in a room with enemies, those enemies will remain frozen permanently as long as Isaac remains in that room, making it a matter of time before the room is cleared. This includes bosses.[1]