Congealed Slime is a way to condense all of your leftover Slimeballs into a block form.The block has the unique property of bouncing any entities with downward momentum and stopping all fall damage. The entity will lose a little bit of momentum with every bounce. Unlike slime blocks in later versions of Minecraft, the player cannot sneak to stop bouncing.
Congealed Green Slime can be found on Slime Islands, where it makes up the Slimy Tree. There is also an purple variation of Congealed Slime that can also be found on Slime Islands. It is also possible to convert the blocks back to their original Slimeballs.
Congealed Green Slime
Congealed Blue Slime
Congealed Green Slime may be replaced with Blue or Purple variant.