• Sudoku: place the digits 1-9 once each in every row, column, and 3x3 box.
• Magic Squares (grey): the sums of each row, column and diagonal are identical.

• Sudoku: place the digits 1-9 once each in every row, column, and 3x3 box.
• *Kropki Dot (black): a black dot between cells indicates cell values with a 2:1 ratio.
• *Kropki Dot (white): a white dot between cells indicates cells with consecutive values.
• *X: cells connected with an X must sum to 10.
• *V: cells connected with a V must sum to 5.
• Shifter Line (lime): adjacent digits within the same box on a shifter line share both parity (even/odd) and polarity (low/high). Whenever the line enters a new box, either the parity or the polarity shifts, never both. Shifter lines can never have 5 on it. Digits may repeat on lines.

*not all possible dots/Xs/Vs are given.

• Sudoku: place the digits 1-9 once each in every row, column, and 3x3 box.
• *Kropki Dot (white): a white dot between cells indicates cells with consecutive values.
• **Killer Cage: digits must sum to the value in the top left corner.
• Palindrome (grey): digits along the line are read the same forwards and backwards.

*all possible dots are given.
**digits can repeat if other rules allow.

• Sudoku: place the digits 1-9 once each in every row, column, and 3x3 box.
• Sandwich: digits outside the grid indicate the sum of the digits between the 1 and 9 in that row or column.
• Fog: when a digit is correctly placed, both its own cell and its surrounding 8 cells will be cleared of fog.
• *Kropki Dot (white): a white dot between cells indicates cells with consecutive values.

*not all possible dots are given.

• Sudoku: place the digits 1-9 once each in every row, column, and 3x3 box.
• *Killer Cage: digits must sum to the value in the top left corner.
• Thermometer (grey): digits along a thermoeter stritly increase from bulb to tip.
• Palindrome (blue and pink): digits along the line are read the same forwards and backwards.

*digits do not repeat.

• Sudoku: place the digits 1-9 once each in every row, column, and 3x3 box.
• Killer Cage: digits must sum to the value in the top left corner.
• *Kropki Dot (black): a black dot between cells indicates cell values with a 2:1 ratio.
• *Kropki Dot (white): a white dot between cells indicates cells with consecutive values.
• Dutch Whispers (red): digits are at least 4 apart from their neighbors on the line.
• Renban (purple): digits on the line are a set of non-repeating, consecutive numbers, in any order.
• Renban+ (yellow): digits on the line are a set of no-repeating, consecutive numbers.

*not all possible dots are given.