Every book is honestly labeled, so you always know what you're getting. Pick a level below to see every matching title.
The gentlest possible start. Lots of numbers already filled in, so you're always making progress. Solvable with the simplest logic — no advanced tricks needed.
A breezy, satisfying solve. A few more blanks to fill, but still smooth and stress-free. Perfect once Very Easy starts to feel quick.
A pleasant little challenge. You'll use a few more techniques and slow down to think — the sweet spot for a focused, screen-free break.
A real brain-stretcher. Fewer starting clues and trickier logic for solvers who want to dig in and savor the satisfaction of cracking it.
Not sure where to start? Grab a free set of 10 puzzles in your chosen level and try it out — no pressure.