This is an Araf Nurikabe puzzle.

The rules for Nurikabe can be found here: Rules page

In this Nurikabe puzzle, each region must contain exactly two numbers. The size of the region must lie strictly between these two numbers.

This is an Araf Nurikabe puzzle.

The rules for Nurikabe can be found here: Rules page

In this Nurikabe puzzle, each region must contain exactly two numbers. The size of the region must lie strictly between these two numbers.

This is a Yajisan-Kazusan Nurikabe puzzle.

The rules for Nurikabe can be found here: Rules page

In this Nurikabe puzzle, cells with numbers may be blacked out. If a number is blacked out, it no longer plays any role in the puzzle.

This is an Anti-Even-Odd Fillomino puzzle.

The rules for Fillomino can be found here: Rules page

In addition to the usual rules for Fillomino, even-sized regions may not touch, and odd-sized regions may not touch.

This is a Relatively Prime Fillomino puzzle.

The rules for Fillomino can be found here: Rules page

In addition to the usual rules for Fillomino, adjacent regions may not share a common factor. The number one is forbidden in this puzzle.

This is a Nonconsecutive Fillomino puzzle.

The rules for Fillomino can be found here: Rules page

In addition to the usual rules for Fillomino, adjacent regions may not have a size that differs by one.

This is a Cipher Liar Yajisan-Kazusan.

The rules for Yajisan-Kazusan can be found here: Rules page

In addition to the usual rules of Yajisan-Kazusan, one clue in every row and every column is mislabelled. If this clue is unshaded, then it does not point to the number of black squares indicated. If it is shaded, then it provides no information.

In addition, each number has been replaced by a letter. Different letters refer to different numbers.

Happy 50th puzzle! Here’s a simple one to celebrate.

This is a Cipher Yajisan-Kazusan puzzle.

The rules for Yajisan-Kazusan can be found here: Rules page

In addition to the usual rules of Yajisan-Kazusan, each number has been replaced by a letter. Different letters refer to different numbers.