How to Play:
Place all the numbers into the 3×3 grid so that every row, every column, and both diagonals sum to the same Magic Sum (15 for a 3×3 grid).

Placing Numbers:
1. Click a number in the tray at the bottom to select it (it glows purple)
2. Click an empty cell in the grid to place it there
3. Click a filled cell (non-fixed) to pick that number back up into the tray

Reading the Hints:
- Numbers on the right side show each row's current sum
- Numbers on the bottom show each column's current sum
- Diagonal sums appear at the top corners
- Green = correct sum · Red = wrong sum

Fixed Cells:
- Gold numbers are pre-filled and cannot be moved — use them as anchors!

Difficulty:
- Easy: 5 numbers pre-filled
- Medium: 3 numbers pre-filled
- Hard: Only 1 number pre-filled

Scoring:
- Base: 500 pts
- Time bonus: up to +300 pts for solving quickly
- Move bonus: up to +100 pts for solving efficiently