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I've been able to add a CustomBlock and texture it so far; just simple stuff. Upping the game and I want to start getting that block to interact with other items in the world, so I've gone through the docs and found onBlockPlacedBy, and I have this class. package com.example.examplemod; import net.minecraft.core.BlockPos; import net.minecraft.world.*; import net.minecraft.world.entity.LivingEntity; import net.minecraft.world.item.ItemStack; import net.minecraft.world.level.block.Block; import net.minecraft.world.level.block.state.BlockBehaviour; import net.minecraft.world.level.block.state.BlockState; public class CustomBlock extends Block { public CustomBlock() { super(BlockBehaviour.Properties.of()); } @Override public void onBlockPlacedBy(World world, BlockPos pos, BlockState state, LivingEntity placer, ItemStack stack) { super.onBlockPlacedBy(world, pos, state, placer, stack); } } All the other imports work correctly, and can find BlockPos, BlockState, LivingEntity, ItemStack but I can't find World. I've tried letting Eclipse find it, but it can't. I've searched the docs, and I can see it, but not for anything past 1.16.x This is on 1.20.1, I don't believe it to be an import issue as other Types can be found and the super.onBlockPlacedBy() knows it needs a World type as its first parameter, yet I can't find where onBlockPlacedBy() is implemented in the inheritance tree either... Any help would be great, I can't seem to find any docs for 1.20.1 that are up to date either.