SudoKanard

Arrow/Thermo/Quadruples Sudoku "400 subs"     Standard Sudoku rules apply. Digits strictly increase along each thermometer starting from the bulb end. The digit in a circle is the sum of all digits along the arrow attached to the circle. When a circle overlaps four cells, the digits in the circle must appear at least once in the four cells.   This puzzle celebrates 400 subscribers to the YouTube channel SudoKanard.   Solve this puzzle on SudokuPad:  https://tinyurl.com/2be2y54h

 Thermo Sudoku Standard Sudoku rules apply. Along each thermometer, digits increase strictly starting from the bulb end. Penpa link: https://git.io/Jukuv

 Stretch Thermo Sudoku Apply classic Sudoku rules. Starting from the bulb, digits placed along a thermometer cannot decrease (they can increase or stay equal). Penpa link to solve online: https://tinyurl.com/y9d5ujdt

  Arrow Thermo Sudoku "200" Standard Sudoku rules apply. The digits along each arrow must sum to the digit in the circled cell. Digits may repeat along an arrow if permitted by other rules. Digits along each thermometer must increase starting from the bulb end. Celebrating 200 subscribers on my YouTube channel . Penpa link to solve online: https://git.io/J9Okc   CtC link to solve online:  https://tinyurl.com/yh3ppdk6

 49     Standard Sudoku rules apply. Little Killer: a number next to an arrow is the sum of all digits along the diagonal pointed by the arrow. Killer: in each cage with a dashed outline, the sum of all digits is written in the top left corner of the cage. Fortress: each digit in a green cell is greater that all digits in orthogonally adjacent white cells. Thermo: along each thermometer, digits strictly increase starting from the bulb. Sandwich: each number in the left margin of the grid is the sum of all digits sandwiched between digits 1 and 9 in the corresponding row. Skyscrapers: each number on top of the grid is the number of buildings visible in the corresponding direction (digits are viewed as building heights and higher buildings block smaller buildings from view). Penpa link: https://git.io/J1jmU

French Revolution: from 1789 to 2021     Standard Sudoku rules apply. Thermo : digits strictly increase along thermometers starting from the bulb. Arrow : the digit in the circle is the sum of all digits along the arrow. X-Sums : each number on the left side of the grid is the sum of the X first digits where X is the first digit seen in that direction. Sandwich : each number above the grid is the sum of the digits that are sandwiched between 1 and 9 in the corresponding column.   Penpa link to solve online: https://git.io/JCqbr