When placing a bomb, both Jacob and Esau place one, but only one bomb will be consumed.
Changes to the speed stat are only half as effective, but the stat is shared between the two characters.
As a result, if the player can handle the increased difficulty from these optional chapter paths, item rooms in Downpour, Mines, and Mausoleum (including their alternative variants) have double their normal value.
With careful positioning, it is possible to take two items in rooms with multiple items that usually disappear upon collecting one (Ex: The Polaroid & The Negative).
Curse door damage will only be applied to the character that moves through the door.
If one character passes through a door, both characters move to the next room.