On use, spawns a three-numbered slot above Isaac's head. Using the item again will lock in the leftmost unlocked number, and cause the other numbers to roll faster. Once all 3 numbers have been locked in, this item will give the player the item with the ID of the number they rolled, then disappear.
Due to this, items with IDs greater than 999, as well as G FUEL! or TMTRAINER items, which have IDs below zero, cannot be obtained this way.
If the item ID is invalid, will teleport the player to an I AM ERROR Room.
This is also true for otherwise valid items that have the internal "Hidden" tag:
Error's Crazy Slots will continue to roll the slots while the game is paused. This is to prevent players from abusing pause buffering in order to time it correctly.
The unassigned item IDs 043, 061, and 666 will always return as invalid; as will any ID greater than the amount of items in the game.
Despite normally being unavailable, IPad and Eternal Clicker can be obtained via Error's Crazy Slots. This is also true for all of the new X10 items.
Dropping Error's Crazy Slots before the slots have finished rolling will cause the slots to continue to roll above Isaac's head indefinitely, as only through using Error's Crazy Slots can the effect be concluded.
With Eternal Car Battery, each use of the item can cause it to disappear before an item is created, causing the numbers to roll over the player indefinitely.
Book of Virtues: Each use of the item will grant a unique error wisp that shoots Continuum tears.
Judas + Birthright: Grants a permanent increase in damage based on the number rolled. For example, rolling the number 118 will grant +1.18 damage.
TMTRAINER: The item generated by Error's Crazy Slots will not be corrupted.
Error's Crazy Slots is a fan suggestion from a member of the Fiend Folio Cornmunity Discord server, Haloway.
The effect of Error's Crazy Slots is a possible reference or successor to the item "Cheat Engine" from The Devil's Harvest MOD, where an item pedestal would spawn on use corresponding to Isaac's held amount of coins, bombs, and keys and the item ID it matches.
I AM ERROR Room.
The Book of Belial obtained by having 
Birthright as 
Judas.
Damocles given to Isaac when using the active version of Damocles.
Recall.
Hold.
Your Eternal Reward and the Boss Badges.
Malice, obtained by using Malice as 
Tainted Fiend.
Clear Case, obtained when gaining a pocket active item.
Eternal D12.
Perfectly Generic Object.
Dogboard.
Angelic Lyre.
Horse Paste.
My Story.
Fiend's Third Leg.
Worm Insignia.
Spelling Bee.
IPad and 
Eternal Clicker can be obtained via Error's Crazy Slots. This is also true for all of the new X10 items.
Car Battery / 
Eternal Car Battery: Grants two copies of the rolled item.
Book of Virtues: Each use of the item will grant a unique error wisp that shoots 
Continuum tears.
TMTRAINER: The item generated by Error's Crazy Slots will not be corrupted.
