小石头#90

The Small Rock is an unlockable passive item.

• 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, before the Halloween Update, the player’s tears were blood tears. The reasoning for the change from blood to grey is unknown.
• This item is used in Head Trauma (challenge #3).
• Head Trauma is unlocked by default, despite the fact that Small Rock isn't. This item, TMTRAINER, Dirty Mind and Spirit Sword are the only items that appear in challenges before they are unlocked. Small Rock and TMTRAINER are also notable for not being unlocked by beating the challenge they appear in. The Binding of Isaac: Rebirth
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