The Small Rock is an unlockable passive item.
Effect
Notes
- It has a small chance to be dropped from a destroyed tinted rock.
The speed and tears changes will take effect immediately; without it, they will not immediately change until Isaac's speed or tears stats are updated the next time.- The rock normally only appears once per run but can appear again if Isaac's items are re-rolled with the D4, D100, or a Dice Room.
- The rock may also appear twice in the same floor if the player does not pick it up the first time encountered, and then bombs another rock to get it again. However, while the Speed down and Tears up stack, the Damage does not.
- Taking the rock in the Boss Rush from a tinted rock in the room will count as taking an item and consequently trigger Boss Rush.
The speed and tears changes will take effect immediately; without it, they will not immediately change until Isaac's speed or tears stats are updated the next time.
In-game Footage
Trivia
- 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.
- However, prior to the Halloween Update, the player’s tears were actually blood tears. The reasoning for the change from blood to grey is unknown.
- This item is used in Challenge #3 (Head Trauma).
Seeds
PC 3V10 RC7Y (The Tinted Rock in room above spawn) 
Vita X830 RRFL (The Tinted Rock in the room below)
3DS F4GJ 7ZHK (The Tinted Rock in the room before the boss room) 
WiiU SFE6 QGF9 (Tinted Rock to left of spawn)
Switch MSKX 1XN8 (Tinted Rock in the room left of spawn)
Switch T8GC DE46 (Tinted rock in the room right of spawn)
 The Binding of Isaac: Rebirth
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