Slimeballs are items dropped by green slimes when killed. Green slimes spawn in any swamp biome at night time or in certain chunks below Y-level 40 at any light level, and can spawn in different sizes. Large slimes will divide themselves into smaller versions when killed, increasing the amount of slimeballs that potentionaly can drop. Slime balls can alternatively be created with milk and lime dye in a factorization crystalizor. Slimeballs are also dropped by Maze Slimes, found in Mazes of the Twilight Forest, oftentimes dropping 32 or more per large slime.