Puzzle 77 (Wittgenstein Briquet)

This is a Wittgenstein Briquet puzzle.

Rules

Puzzle 76 (Nurikabe Pairs)

This is a Nurikabe Pairs puzzle. This variation was created by Palmer Mebane.

Rules, with the change that every region of unfilled cells must contain exactly two numbers (instead of one) and have total size equal to the sum of the two numbers. (rules taken from Palmer Mebane's blog)

Puzzle 75 (Tapa)

This is a Tapa puzzle. This puzzle type was created by Serkan Yürekli. 

Rules

Puzzle 74 (Yajilin)

This is a Yajilin puzzle.

Rules