Tetradent24 Crystal Forge

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The Copper Hearth

A new spark awaits

Four crystals. Three joins. One perfect 24.

FORGE24use every stone
Warming the crystal forge…
“Every crystal has a part to play.” Select two stones, then an operation
A little arithmetic. A little alchemy.

Welcome to the
Crystal Forge.

Help a tiny brass beetle turn four numbered crystals into exactly 24.

  1. Choose two crystals. First and second matter for subtraction and division.
  2. Pick +, −, ×, or ÷. Their result becomes one new crystal.
  3. Use all four. After three joins, your final crystal must be 24.

Fractions are welcome. Undo is unlimited. Take your time.
The smith’s field notes

Follow the numbers.

Tap two stones in order, then choose an operation. You can also choose an operation first. Tap a selected stone to remove it, or swap the pair before joining.

Example: with 1, 2, 3, 4, join 1 + 2 = 3, then 3 + 3 = 6, then 6 × 4 = 24. Every starting stone is used once.

Negative numbers and exact fractions are allowed. Division by zero is never allowed. If the last crystal is not 24, undo a join and explore another path.

Earn ★★★ without hints, ★★ with one hint, or ★ with more. Undo and reset are free. Each difficulty keeps its own stars and level progress.

On a keyboard, select stones with 1–4, choose + − * /, undo with U, reset with R, and ask for a hint with H. Press Escape to clear your pair.