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Placement

Pick a block with V, then build. Modes cycle with Left Alt.

Single Block

Click to place on the face you're looking at (also works in mid-air). Shift + hold paints a trail as you move.

Fill

Left-click sets corner 1, right-click sets corner 2; the region fills with a live preview (cap 32768). Shift + right-click toggles Solid ↔ Air/Remove, so Fill can also delete.

Block Tracker

Three sub-modes (also Left Alt):

  • Floor Maker — walk forward to lay a permanent path under you.
  • Defense Wall — hold right-click to keep a wall in front of you, following your aim. Left-click drops it in place, Shift + left-click pushes it out, Shift + right-click re-grabs it. ` + scroll sets its distance.
  • Shaper — Shift + right-click switches shape (Wall / Stairs / Platform), hold right-click to build. In Stairs, ` + scroll grows or shrinks the staircase.

Jumping while walking forward drops a block under you — quick stairs. The V chooser has tabs, search, and C− / C+ to resize the grid.