Book of machines is an active item in Playable Machines, a mod for The Binding of Isaac.

Spawn a random machine on use.

This item contributes towards the Bookworm transformation. Collecting 3 items from this set will make Isaac fire an extra tear 25% of the time.

Book of machines can be found in the following item pools:

The following tags are applied to this item:

• Download Playable Machines from the Steam Workshop.