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Builder Essentials

A tModLoader mod that improves Terraria's building experience — mirror placement, shape drawing, fill and multi-wands, an improved ruler, auto-hammering, infinite paint, and undo/redo for world edits.

Status: no longer maintained. Actively developed and supported 2020–2023, reaching ~100k downloads on the original tModLoader mod browser and ~50k subscribers after migrating to the Steam Workshop.

What's inside

  • Undo/redo for tile placement — a capacity-bounded history (Common/Data Structures/HistoryStack.cs, PlacementHistory.cs) over a mutable tile world.
  • Mirror placement (Common/MirrorPlacement.cs) — live-mirrored building across a player-defined axis.
  • Shape tools (Content/UI/Shapes/) — geometry helpers and a custom UI state system on top of the game's UI framework.
  • QoL items and crafting stations (Content/Items, Content/Tiles), server-side config, localization, and keybind-driven toggleable UIs.

Art by Strunter (sprites); code by Kirtle.

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