This is a pack of ten puzzles that I created just before the UK went into lockdown at the start of the COVID-19 pandemic. Since "uncertainty" was a bit of a buzzword at the time, I themed the puzzles around uncertainty; in each puzzle, there are two variant rules, and part of the puzzle is working out which rules apply to which parts of the grid.
General Rules: In each puzzle, place a number from 1 to 9 into each empty cell so that every row, column, and bold-outlined region contains every number exactly once.
#1 - Diagonal or Anti-Diagonal?
Diagonal Sudoku rules: Marked diagonals must contain each number exactly once.
Anti-Diagonal Sudoku rules: Marked diagonals must contain exactly three distinct numbers.
In this puzzle, one of the marked diagonals follows Diagonal Sudoku rules and the other follows Anti-Diagonal Sudoku rules.
Difficulty: 5/10
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#2 - Clone or Extra Regions?
Clone Sudoku rules: Identical shaded regions must contain the same numbers in corresponding locations.
Extra Regions Sudoku rules: Shaded regions must contain each digit exactly once.
In this puzzle, two of the shaded regions follow Clone Sudoku rules and the third follows Extra Regions Sudoku rules.
Difficulty: 6/10
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#3 - Killer or Somewhere?
Killer Sudoku rules: The numbers placed into each marked cage must sum to the total given in the corner of the cage. Numbers cannot repeat in a cage.
Somewhere Sudoku rules: Each number written in the corner of a marked cage must appear somewhere in that cage. Numbers cannot repeat in a cage.
In this puzzle, each cage follows either Killer Sudoku rules, or Somewhere Sudoku rules, or both.
Difficulty: 6/10
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#4 - Consecutive or Tens?
Consecutive (Pairs) Sudoku rules: Two numbers separated by a white dot must be consecutive.
Tens (Pairs) Sudoku rules: Two numbers separated by a white dot must sum to 10.
In this puzzle, each dot follows either Consecutive (Pairs) Sudoku rules or Tens (Pairs) Sudoku rules.
Difficulty: 5/10
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#5 - Sum or Average Arrow?
Arrow Sudoku rules: The number placed in a circle must be equal to the sum of the numbers along the adjoining arrow.
Average Arrow Sudoku rules: The number placed in a circle must be equal to the average of the numbers along the adjoining arrow.
In this puzzle, each arrow follows either Arrow Sudoku rules or Average Arrow Sudoku rules.
Difficulty: 7/10
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#6 - Palindrome or Creasing?
Palindrome Sudoku rules: The numbers placed along each line must form a palindromic sequence.
Creasing Sudoku rules: The numbers placed along each line must form a strictly increasing or decreasing sequence.In this puzzle, each line follows either Palindrome Sudoku rules or Creasing Sudoku rules.
Difficulty: 4/10
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#7 - Renban or Anti-Renban?
Renban Sudoku rules: Each shaded area must contain a set of distinct, consecutive numbers in any order.
Anti-Renban Sudoku rules: Each shaded area must contain a set of distinct numbers, no two of which are consecutive.
In this puzzle, each area follows either Renban Sudoku rules or Anti-Renban Sudoku rules.
Difficulty: 5/10
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#8 - Frame or X-Sums?
Frame Sudoku rules: Clues outside the grid give the sum of the first three numbers placed in the corresponding direction.X-Sums Sudoku rules: Clues outside the grid give the sum of the first X numbers placed in the corresponding direction, where X is the first of those numbers.
In this puzzle, each clue follows either Frame Sudoku rules, or X-Sums Sudoku rules, or both.
Difficulty: 6/10
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#9 - Outside or Next to Nine?
Outside Sudoku rules: Numbers appearing in clues must be placed in the first three cells in the corresponding direction.Next to Nine Sudoku rules: Each clue gives all digits that are directly adjacent to the 9 in the corresponding row or column.
In this puzzle, each clue follows either Outside Sudoku rules, or Next to Nine Sudoku rules, or both.
Difficulty: 4/10
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#10 - Search Nine or Point to Next?
Search Nine Sudoku rules: If a number N is placed on an arrow, then 9 must be placed in the cell pointed at by the arrow at a distance of N.
Point to Next Sudoku rules: If a number N is placed on an arrow, then N + 1 must be placed in the direction of the arrow.
In this puzzle, each arrow follows either Search Nine Sudoku rules, or Point to Next Sudoku rules, or both.
Difficulty: 5/10
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