Forget Me Now

Forget Me Now is an unlockable activated item.

Effects

On use, the current floor will be completely re-generated and Forget Me Now will be removed from Isaac's inventory.
- Isaac will restart the level as if he had entered a new floor.
- This will be a brand new floor, with different rooms and mapping generation.

Notes

The re-generated floor will count as the same floor number as the one Isaac used Forget Me Now in.
- If a Devil Room / Angel Room is not encountered after defeating the boss of the re-generated floor, the multiplier tied to the number of floors since the last Devil/Angel Room affecting the spawn chance will not change.
  - If the first possible Devil Room is encountered, the 100% chance for the next deal to be an angel chance is preserved upon regenerating the floor.
- If a Devil/Angel Room is encountered before regenerating the floor, the multiplier will become x0.25 upon regenerating the floor.
Any items earned before using the re-generation effect will remain in Isaac's inventory.
There is an extremely brief time window after using Forget Me Now where Isaac can pick up another active item before the floor regenerates.
If used on the Depths / Necropolis / Dank Depths II after beating Mom, both The Negative and The Polaroid can be obtained in one run. Additionally, two Boss Rushes can be entered as long as the total playtime of the run stays under 20 minutes.
- This also allows opening the door to Mausoleum / Gehenna II in the starting room.
If used on Downpour / Dross II after collecting Knife Piece 1, a second Knife Piece 1 will spawn in the mirrored world's Treasure Room, which can be rerolled into a random item from the Treasure Room (Item Pool).
If used on Mines / Ashpit II after collecting Knife Piece 1 and Knife Piece 2, a second Knife Piece 2 will spawn in the chase sequence, which if picked up results in a Knife Piece 2 familiar following Isaac if he doesn't have a second Knife Piece 1.
If used on Chest or Dark Room when the door to Mega Satan has been opened, the golden key will not re-open the door and you will be unable to fight him.
If used on an XL floor, the merged chapter can be re-generated as two separate floors instead.
If used on Womb II/Utero II/Scarred Womb II after defeating Mom's Heart, and Mom's Heart is again defeated on the regenerated floor, it will count as having defeated Mom's Heart 2 separate times, therefore unlocking 2 consequent endings.
Challenge Rooms and Boss Challenge Rooms will have the same rewards and enemy waves as the Challenge Room in the previous iteration of the floor.
If left in a Treasure or Boss Room and then returned to during the Ascent, the Forget Me Now item will return to the room it was left each time it is used, allowing the floor to be repeated indefinitely.
- This can be useful in conjunction with The Stairway, as it allows for unlimited Angel Shops to be visited.
- Upon reentry, items, pickups, and trinkets left in the treasure and boss room after using Forget Me Now will be removed and not converted into cracked keys.
If used on Home, each room is re-generated and players can obtain an additional item from the chest in Mom's room.
If used in Floor 1, the chance of Devil/Angel room is still 0%.
If a Treasure Room hasn't been visited, the Planetarium chance persists unchanged.
If used on Mausoleum or Gehenna II after the special version of Mom's Heart is defeated, the newly generated floor will be dimly lit as though Mom's Heart was already defeated. Additionally, no items will naturally generate in rooms where they would have. After the player defeats Mom again, there will be no flesh door, and the trapdoor to Corpse will appear.
This item is significantly useful for both score and time-related daily runs. For score, it gives you a significant boost of exploration while for time, using it on the final floor locks in the finish time at which it was consumed. Meaning — you don't have to do the final floor and save up a lot of time.

Synergies

The Book of Belial + Birthright as Judas / Dark Judas: Grants +2 damage up for the entirety of the new floor.
Book of Virtues: Spawns a wisp in the middle ring with infinite health. The wisp only lasts for the floor Forget Me Now created.
Glowing Hourglass + Schoolbag: Using Forget Me Now will fully recharge Glowing Hourglass on the new floor, using Glowing Hourglass after that will take Isaac back to the previous room while also giving back Forget Me Now. This allows for infinite usage of Glowing Hourglass as well as infinite retries of any room as long as Forget Me Now is used before the room is cleared.

Interactions

Car Battery: No effect.

In-game Footage

Gallery

3DS The icon of Forget Me Now as seen on the lower 3DS screen.

Trivia

"Forget me now" is a reference to the show Arrested Development, in which Gob the magician gives people who have figured out how he does a trick a "Forget-me-now", which is a Roofie.
The 5 pip Dice Room has the same effect as Forget Me Now.
Plan C has the same sprite as Forget Me Now tinted red.
In the original Binding of Isaac, this item was present in the Devil Room item pool. It was restored to that pool in Repentance.

Bugs

Bug!	The new floor is improperly seeded. This results in a high chance for rooms to repeat from the previous floor. This is most noticeable when looping via the error room. This bug is due to ForgetStageSeed using the same xorshift constants as the level generator.