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This is a highly compact TNT cannon design. It features minimal horizontal spread of the TNT projectiles, ensuring greater accuracy.

Materials Required

18 block types · 55 blocks · 4×4×8

Obsidian29
Water4
Oak Trapdoor3
Repeater3
Observer2
Redstone Wire2
Activator Rail1
Anvil1
Dispenser1
Glass1
Oak Fence Gate1
Oak Wall Sign1
Piston Head1
Red Concrete1
Redstone Torch1
Sticky Piston1
Stone Brick Slab1
Stone Button1

Before You Build

This build uses 55 blocks across 18 block types – about 1 stacks in total, which fits inside a single shulker box. It occupies 4×8 blocks of ground and stands 4 blocks tall.

What to bring first

Obsidian – 29
Water – 4
Oak Trapdoor – 3
Repeater – 3
Observer – 2

Survival or creative?

Every block in this build can be obtained in survival, so it can be built by hand without creative mode or commands. You will need Silk Touch for Glass.

Moving parts

It includes Activator Rail, Dispenser, Observer, Redstone Torch, Redstone Wire, Repeater, Sticky Piston, so check the mechanism still works after pasting – redstone state and item-container contents do not always survive a paste.

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