Fill every row, column and 4×4 box with 1-9 and A-G — no repeats. Bigger, bolder, and just as addictive.
Tap a cell, then tap a symbol (1-9 or A-G) or use your keyboard. Blue symbols are yours; bold ones are the puzzle's clues.
Type in a 16×16 puzzle you're stuck on, then hit Solve. Use 1-9 and A-G; leave blanks empty.