ZagSum

1. Place the digits 1 to 9, each once, in the 9 cells.
2. Each row, worked left to right, must equal the number on its right. Each column, worked top to bottom, must equal the number below it.
3. Work strictly in order, not normal math order: 2 + 3 × 4 here is (2 + 3) × 4 = 20. Results along the way may be fractions; only the final answer must hit the target.
4. The gold digit is given to start you off.

Tools

• Tap a cell, then a digit. Digits already on the board are greyed out on the keypad.
• Notes: pencil in the digits a cell might be. Placing a digit removes it from your notes everywhere else.
• A digit used twice turns red.
• A target turns green when its line is full and right, red when full and wrong.
• Hint: one per day. It fills the selected cell, or one at random. It shows in your shared result.
• Keyboard: arrows move, 1-9 fill, Backspace erases, N toggles notes.