SudoKanard

 Slow Thermo Overlapping Sudoku Apply classic Sudoku rules on each of the two overlapping 3×3 grids. Along each thermometer, digits do not decrease: starting from the bulb end, each digit is higher than or equal to the previous one. Solve on Penpa: https://tinyurl.com/27s73xk9

 Classic Sudoku Standard Sudoku rules apply. Solve this online on Penpa: https://tinyurl.com/2e29m5wu

 Full Rank Sudoku Apply classic Sudoku rules. Full rows/columns (read left-right, right-left, top-bottom, bottom-top) form 36 distinct 9-digit numbers. Their ranks from the lowest are given. Solve on Penpa: https://tinyurl.com/2laz99vw

 Battenburg Little Killer Sudoku Apply classic Sudoku rules. Whenever two odd and two even digits form a 2×2 chessboard pattern, a Battenburg marking is given. If there is no marking, the above pattern is not allowed. Each clue outside the grid indicates the sum of the digits contained in the cells in the direction of the corresponding arrow. Solve on Penpa: https://tinyurl.com/2ld3ktjp

 Position Sums Sudoku Standard 6x6 Sudoku rules. On each row, the leftmost two digits are A and B. An unshaded number in the left margin is the sum A+B of the corresponding row. A shaded number in the left margin is the sum of the Ath and Bth digits in the corresponding row starting from the left. The same applies to columns starting from the top. Solve on Penpa: https://git.io/JgAG2

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

 Quadruple Sudoku Standard Sudoku rules apply. Digits in a circle must appear at least once in the surrounding four cells. Solve on Penpa: https://tinyurl.com/yxuobgtg Solve on SudokuPad: https://tinyurl.com/36v2ypwu

 Killer/X-Sums Sudoku Apply classic Sudoku rules. The digits placed in each marked cage must sum to the total given in its top-left corner. Digits must not repeat in cages. Each clue outside the grid indicates the sum of the first digits placed in the corresponding direction, where X is equal to the first digit placed in that direction. Solve this puzzle on Penpa: https://tinyurl.com/2rybmlhj

 X-Sums Sudoku Standard Sudoku rules apply. Each clue in the margin is the sum of the first X digits in the corresponding direction, where X is the digit next to the clue.   Penpa link to solve online: https://tinyurl.com/2fzntxej

Determinant Sudoku Classic Sudoku rules apply. Each number in a square is the determinant of the underlying 2×2 array, i.e. the result of the operation [(top left) times (bottom right)] minus [(top right) times (bottom left)]. Solve on Penpa: https://tinyurl.com/26xu7ly5

 No Touch Sudoku Standard Sudoku rules apply. Any two cells sharing a corner must contain different digits. Solve on Penpa: https://tinyurl.com/y6jz8at4 Solve on SudokuPad:  https://tinyurl.com/2abn6888

 Killer/Quadruples Sudoku Standard Sudoku rules apply. Killer : the digits in a cage must sum to the number printed in its corner; digits may not repeat within a cage. Quadruples : circled digits where four cells meet must be present as values in those four cells. Solve on Penpa: https://tinyurl.com/22685wop Solve on SudokuPad:  https://tinyurl.com/y4uw5arv

 Irregular Sudoku Place a digit from 1 to 9 in each cell. Each column, each row and each outlined region must contain every digit once. Solve on Penpa: https://tinyurl.com/y3gvvymm Solve on SudokuPad: https://tinyurl.com/2acphwsk

X-Sums Sudoku Standard Sudoku rules apply. Each clue outside the grid indicates the sum of the first X numbers placed in the corresponding direction, where X is equal to the first number placed in that direction. Penpa link: https://tinyurl.com/2yg7v7au SudokuPad link: https://shorturl.at/swH19

 Next to Nine Sudoku Classic Sudoku rules apply. Digits outside the grid, when given, are the complete list of digits adjacent to digit 9 in the corresponding row/column. Digits are given in increasing order regardless of the order they appear in the corresponding direction. Penpa link: https://tinyurl.com/2lgek6na

  Antiknight Sudoku Standard Sudoku rules apply. Any two cells separated by a chess knight's move must contain different digits. Penpa link: https://tinyurl.com/2ptmqtsf

 Killer Sudoku Standard Sudoku rules apply. Also, the sum of the digits in each cage must equal the value given in the upper-left corner of that cage. Digits cannot repeat inside a cage.   Penpa link:  https://git.io/Juki6

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

 Classic Sudoku Classic Sudoku rules apply. Penpa link: https://git.io/JukVK Video solution (with French commentary):  https://www.youtube.com/watch?v=gGm8uCJfv84

 Tom-Tom & Parity Party Sudoku "50"   Standard Sudoku rules apply. Parity Party: a number outside the grid is the sum of the first digits up to (and including) the first even digit or the first odd digit seen in that direction. Tom-Tom: there is at least one elementary operation (addition, subtraction, multiplication, division) which, applied to all digits in the cage, yields the total given in the top left corner of the cage. Digits may repeat in the cage if allowed by the other rules.     Penpa link to solve this puzzle online: https://tinyurl.com/2k95ezko Dedicated to all people who turn 50 this summer. Parity Party was invented by Glum Hippo. You can find other puzzles with this rule here: https://logic-masters.de/Raetselportal/Benutzer/eingestellt.php?name=glum_hippo