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  • Boulder item sprite
  • Boulder placed
Stack digit 9.pngStack digit 9.pngStack digit 9.png
PlaceableYes 2 wide × 2 high
Use time15 Very Fast
RarityRarity level: 0

Boulders are unique placeable 2×2 foreground objects, and are stationary when placed. When unsupported, they fall and begin to roll away. They pick up speed and damage players, enemies and NPCs along their path. Boulders will also begin to roll if mined with a pickaxe or drill, meaning that they cannot be picked up again once placed.

Boulders will roll across flat surfaces and down slopes, but will break and disappear on contact with an obstacle. On contact with entities, they cause damage in the range of 60-80 per hit. Players take double / quadruple (×4) the damage. Boulders pierce through an unlimited number of entities.

Boulders always roll left, unless there is no space for them to go left, in which case they roll right.

Boulder traps occur naturally in the Underground and Cavern layers, and consist of a single Boulder in the ceiling, supported by six (2×3) Active Stone Blocks wired to Pressure Plates. If a player walks onto the Pressure Plate, the Boulder falls and damages any players or entities it hits.

Crafting[edit | edit source]

Recipe[edit | edit source]

ResultIngredientsCrafting station
Tinkerer's WorkshopTinkerer's Workshop
total: 1 row(s)

Notes[edit | edit source]

  • Once rolling, Boulders cause the same amount of damage regardless of their speed. A player or enemy hit by a Boulder that just began rolling will take just as much damage as they would from a fast-moving Boulder. This also means that players trying to mine it while touching it will be hit.
  • Boulders can be placed atop flat-surface furniture, such as bookcases, and can be stacked on each other. Mining the bottom Boulder causes all of them to fall and roll. Mining only the top Boulder causes only that one to roll off.
  • Boulders can activate red, green and yellow (NPC-sensing) Pressure Plates by rolling over them.
  • Boulders are unable to fit through 2-tile high spaces in the Console version Console version.

Tips[edit | edit source]

  • In Expert modeDesktop VersionConsole VersionMobile Version, boulder traps should be avoided at all costs, considering the deadly force of 280 damage on average.
  • Boulders are effective when used along with Grenades against The Destroyer and Eater of Worlds.
  • Using boulders is an efficient way to kill NPCs, should one wish to do that (for example, for getting their unique drops).
  • Players can detect Boulder traps "in the wild" by wielding a mechanism item such as a Pressure Plate, by carrying a Mechanical LensDesktop VersionConsole Version or its upgrade The Grand DesignDesktop VersionConsole Version or by using a Dangersense Potion. All except the last will allow the player to view placed wires, and the vertical wire with its 2×3 rectangle atop it is quite distinctive. Once detected, there are some basic ways to disarm them:
    • If approaching from above, the player can mine their way toward the top of the trap, and use a pickaxe to break the boulder from outside the sealed chamber.
    • From below, the player can make sure there is a slope downwards to the left, then trigger the plate from the right side and immediately dodge to the right.
Once the boulder is released and avoided, the wise player will follow it and carefully break it, to avoid later trouble. Similarly, merely breaking the pressure plate will prevent the trap from triggering, but the boulder will remain above, and may be encountered later.
  • As with other traps, the mechanisms (but not the boulder) can be harvested for later use. The pressure plate and active stone can be taken with a pickaxe, but collecting the wire needs a Wire Cutter or upgrade thereof.
  • In Hardmode, the activated stone blocks don't change into their respective biome. Therefore, they can be much easier to spot and deactivate.

Trivia[edit | edit source]

  • Boulders are one of two non-accessories that are crafted at a Tinkerer's Workshop, the other being the Cell Phone.
  • Boulders are the only placeable objects that cannot be picked up again once placed, as hammers have no effect on them, and mining them with a pickaxe or drill only causes them to roll (or destroys them, if they cannot roll).
  • At full tilt, boulders roll faster than a running player with several speed boosts applied. Using a Hoverboard or Asphalt can however overcome them.

History[edit | edit source]

  • Desktop
    • Sprite updated.
    • Damage from Boulders is now reduced by player defenses (Boulder damage previously ignored player defense).
  • Desktop 1.2.4: Fixed the crash when a chest is placed above but not directly on a Boulder.
  • Desktop 1.2.3: Boulders with Chests on them no longer crash the game if the boulder is hit.