The Small Rock

The Small Rock is an unlockable passive item.

Effect

 * +1 Damage up.
 * -0.2 Speed down.
 * +0.2 Tears up.

Trivia

 * This item could be a reference to the Bible: John 8:7 as it says: "Let he who is without sin cast the first stone[...]".
 * It could also be a reference to the Biblical story of David and Goliath, as David lobbed a small rock at Goliath's forehead (hence the item location on Isaac), instantly killing him.
 * In the original Binding of Isaac, the player's tears would take on a grey color after Small Rock has been picked up. In Rebirth, however, the tears will be red.
 * This item is used in Challenge #3 (Head Trauma).

Seeds
3V10 RC7Y (The Tinted Rock in room above spawn) X830 RRFL (The Tinted Rock in the room below) F4GJ 7ZHK (The Tinted Rock in the room before the boss room) SFE6 QGF9 (Tinted Rock to left of spawn)