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Speed stat

The movement speed of Isaac.

Speed is calculated by a multiplier of current speed, base speed being 1.0. Each starting character has a base speed multiplier and items collected will increase or multiply this value depending on its effect. Speed modifies a constant, so the player can never be immobile.

Unlike other stats, Speed does possess an absolute limit, meaning once Speed hits a certain value it cannot be raised any further.

Modifiers

Normal Modifiers

If the speed after this modifiers is more than 2 (200%) it will be reduced to 2 (200%).

Modifier Modifies
Base 1 (100%)
Maggy -0.15 (-15%)
??? +0.1 (+10%)
Samson +0.1 (+10%)
Eve +0.23 (+23%)
Cain +0.3 (+30%)
The Virus* -0.1 (-10%)
Odd Mushroom (Large)* -0.1 (-10%)
The Mark +0.2 (+20%)
Blood Bag +0.3 (+30%)
Wooden Spoon +0.3 (+30%)
Belt +0.3 (+30%)
Mini Mush +0.3 (+30%)
The Halo +0.3 (+30%)
Whore of Babylon +0.3 (+30%)
Odd Mushroom (Thin) +0.3 (+30%)
Lord of the Pit +0.3 (+30%)
Growth Hormones +0.4 (+40%)
Roid Rage** +0.6 (60%)

* Sum of all collected copies of The Virus and Odd Mushroom (Large) will always be -0.1 (-10%).
** Even if you will be able to collect 2 copies of Roid Rage, only the first one will be active.

Special Modifiers

This modifiers are applied after sum of normal was reduced to 200% or below.
I.E. if you collected Small Rock then speed from normal modifiers will be limited at 180%.
If you collected Small Rock and Bucket of Lard - at 160%.

Modifier Modifies
Small Rock -0.2 (-20%)
Bucket of Lard -0.2 (-20%)
SMB Super Fan -0.2 (-20%)
Goat Hoof +0.15 (+15%)
The Nail activated -0.18 (-18%)
Unicorn, The Gamekid or VII The Chariot activated +0.28 (+28%)
Holding A Pony or White Pony* If speed is < 1.5, set it to 1.5

* Applied after everything else

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