Minecraft wiki entry for Superflat_survival, associated text: Slimes, especially large slimes, can be annoying as they can spawn during the day on the surface in the flat world. Slimeballs can craft in crafting table to make slime block that can make a instant mining block, or you can throw it away because it not much useful in this time. You can also ignore tiny slimes, just kill large and medium ones, but don't kill small-sized slimes, kill as many large and medium slimes as you can. Because small slimes don't deal damage or knockback and follow you, a horde of tiny slimes (16+ tiny slimes) can useful to protect you from skeleton's arrows. When a skeleton shoots an arrow at you, skeleton arrow has a high chance to hit small slimes that jump toward you. Slime barriers work only against skeletons. Creepers destroy this barrier with their explosions while witches can hit multiple slimes as well as you.