Java Edition Beta 1.9 Prerelease 2

Other editions with a version "1.9-pre2":

Beta 1.9 Prerelease 2 is the second pre-release for Java Edition 1.0.0, released on September 29, 2011,^[1] which adds cauldrons, glass bottles, potions, effects, animal breeding mechanics, 9 more music discs, Hardcore mode, and the ability to clear effects by drinking milk.

Additions

Present in the code, but not assigned to a block ID, making it unobtainable without mods, even with inventory editing.
Can be filled with a water bucket to start brewing. The liquid defaults to a mundane potion with no effects.
Holds 3 bottles worth of any potion.
Ingredients can be added to change the potion's effects. Most potions will end up with negative effects, in an attempt to make clean potions harder to brew^[2].
The initial mundane potion appears as water, but once ingredients are added, it uses a tinted lava texture.
Refilling a potion cauldron with a water bucket will also change its effects.

Drinkable, giving one or multiple effects, or none.
Can be poured back into a cauldron, unless it is full or already contains a different potion.
Has one of 32 generic names, with the actual effects being listed in the tooltip.
Identical potions can be stacked to 64. Due to hidden differences in their aux value, some potions that appear the same cannot be stacked together^[2].

New system to breed animals.
- Remains incomplete, as baby mobs aren't introduced yet.
- Snow golems can be bred. This was removed in the next prerelease.

Hardcore mode

Locks the difficulty to Hard and forces users to delete the world's save data upon death.
The health bar changes appearance to indicate the game is in Hardcore mode.