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This is a puzzle book. You can print it out and solve with a pencil, but I recommend opening it in a PDF viewer and drawing on it with the highlighter tool. This makes it easier to erase when puzzles get tough.

Use a PDF-annotator but NOT Firefox's built-in viewer. You can use Microsoft Edge, Lumin pdf (https://app.luminpdf.com/), or install Xournal++ (https://xournalpp.github.io/installation/), or other options below.

              Free PDF annotators:

Downloadable: 

• Xournal++ (https://xournalpp.github.io/installation/) is open-source and you can enable right-click erase in Edit --> Preferences --> Mouse.
• Drawboard (free version) (https://www.drawboard.com/download) has the best default controls (tool palette, right-click erase) but is pushy about upgrading to premium.

In-Browser:

• Lumin pdf (https://app.luminpdf.com/) is the Google Drive default and works well on desktop and is alright for mobile.
  
• Microsoft Edge has no undo button or opacity options, but the highlighter should work fine.
• Kami (web.kamihq.com) can be laggy and requires sign-in but is pretty easy to use.  Use either the markup highlighter tool ("freehand"), or the pen tool (size 6, opacity 50%).
• SmallPdf (smallpdf.com/edit-pdf) seems okay but I haven't tested it much. Might have an daily export limit?
• Firefox (pdf.js) is not recommend, due to how erasing works.

Alternatively, you can print it out and solve with pencil and eraser. Color printing is preferred but not required.