Puzzles for a reMarkable.

1. Fixed layout, not reflowing text. An EPUB reflows to fit the screen, and a reflowed puzzle is a broken puzzle. A grid has to arrive as a grid, which in practice means a PDF.
2. Drawn to the screen size. The reMarkable 2 reads 1404 by 1872 pixels at 226 ppi and the Paper Pro 1620 by 2160 at 229 ppi. A file laid out for US Letter gets shrunk to fit, and the small print shrinks with it.
3. Cells a stylus can hit. A cell you can fill with one short stroke is worth more than four extra rows of puzzle.
4. Marks that come off cleanly. Hard puzzles of any type are solved by trying something and backing it out, so the eraser matters more than the pen latency does.
5. Answers you can reach without losing your place. A linked answer page beats scrolling to the back and hunting for the way home.
6. Black and white, with no grey fills. The reMarkable 2 is greyscale and the Kindle Scribe is too. Anything that leans on shading or colour to carry meaning either dithers or vanishes.

Nonograms ask for two marks and nothing else: fill a square, cross a square off. No letters, no digits, no reading. Cells stay large even on a 20 by 20 grid, and a wrong square lifts off with one pass of the eraser. This is the type that gives an e-ink tablet the least to do.

Mazes are gentler still: one continuous line, and almost nothing to take back.

Sudoku and kakuro want a written digit in every cell, and the candidate marks that make them solvable want several more in the corners of the same cell. That is a lot of small handwriting. They work, but the cell size you need is larger than the printed versions get away with.

Crosswords and logic grids carry a clue list that has to live on the same screen as the grid. On a six inch page the two rarely fit together, so you spend the puzzle moving between them.

Word searches mostly ask you to circle things, which suits a stylus, but the letter grid is dense small type and it is the first thing to suffer if the page was not drawn for the screen.

We publish nonogram books, so a list of the best puzzle books for a reMarkable written by us would be worth exactly what you paid for it. We have not bought, loaded or solved other publishers' books, and we are not going to rank things we have not used.

What is above is the part we can stand behind: the properties that decide whether a puzzle file works on this hardware. Hold any book you are considering against those six checks, ours included. Ask the seller what page size the file is drawn to, and take the free sample if there is one.