Fill every row, column, and block with each symbol exactly once.
Rules — Each row, each column, and each bold-bordered block must contain every symbol in the legend exactly once. Blue cells are given (fixed). Click a cell, then click a symbol button (or press a key) to fill it. Keyboard — Arrow keys navigate. For Classic/Hex type the character directly. For ASCII type the symbol. Press Delete or Backspace to erase. Scoring — +10 pts per correct cell, −5 pts per error. Time bonus: faster finish = higher final score multiplier.