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2020-November-26: My book End Times Sudoku: 300 Easy Puzzles to Get You Through 2020 (the first volume in my Ephemeral Sudoku series) will disappear from Amazon.
in just a few days, to become a distant memory. Your book purchases help support this free site. Thank you!

Area 51 Puzzles by KrazyDad, Volume 1

Here are hundreds of free Area 51 puzzles suitable for printing. Area 51 is a Slitherlink variant invented by David Millar. Along with Slitherlink, it also shares rules with Masyu and Corral (which I call Cow and Cactus). The instructions may seem quite complicated if you are unfamiliar with these other puzzles, but it's worth a little perseverance, as the combination of those elements makes for a uniquely satisfying solving experience.

Because there are so many clue types, I have omitted instructions from the puzzle booklets, but fear not: here is a printable page of instructions on how to solve Area 51 puzzles.

Thanks to David Millar, who invented this puzzle format!