You can write small or large numbers, whichever you find easier. If you write small numbers (about the size of a puzzle cell), the number will go into the cell that you write in. If you write large numbers, the number will go into the cell that you start writing in.
Like all Puzzazz titles, this book features hand-built, carefully crafted puzzles -- some of the best Sudoku puzzles you'll find anywhere.
No matter which Kindle you use, this Unbound puzzle collection gives you a great solving experience right on the page. Of course, you can use in-cell notes as you solve, just like you do on paper. If you're stuck, move on to a different puzzle -- you can always turn back to that page later. Or, get a hint and keep going.
You'll be both challenged and delighted with by this book of elegant puzzles that fit your personal skill level, because you can change from easy to medium to hard or back at any time. Whatever your skill and solving style, you'll appreciate the calibrated difficulty of the puzzles.