• Sudoku: place the digits 1-9 once each in every row, column, and 3x3 box.
• Arrow: digits along an arrow line must sum to the value in the circle/pill. Multi-digit circles/pills are read left to right, up to down.
• *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.

*not all dots are given.

• Sudoku: place the digits 1-9 once each in every row, column, and 3x3 box.
• Thermometer: digits along a thermometer strictly increase from bulb to tip.

• Sudoku: place the digits 1-9 once each in every row, column, and 3x3 box.
• German Whisper Line (green): adjacent digits along the line must differ by at least 5.
• Renban Line (purple): digits along the line contain consecutive digits in any order.
• Thermometer: digits along a thermometer strictly increase from bulb to tip.

• Sudoku: place the digits 1-9 once each in every row, column, and 3x3 box.
• Arrow: digits along an arrow line must sum to the value in the circle/pill. Multi-digit circles/pills are read left to right, up to down.
• Thermometer: digits along a thermometer strictly increase from bulb to tip.

• Surowku: place the digits 1-9 once in every row 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.

*not all dots are given.

• Sudoku: place the digits 1-9 once each in every row, column, and 3x3 box.
• Entropy: low digits (1, 2, 3), medium digits (4, 5, 6), high digits (7, 8, 9). In each 3x3 box, each horizontal row will have one low, medium, and high digit.
• Knight's Move: digits a kight's move away in chess cannot be the same.
• Positive Diagonal: any positive diagonal goes from south-west to north-east. Neighbouring digits on a positive diagonal must be equal, when other rules allow.

• Sudoku: place the digits 1-9 once each in every row, column, and 3x3 box.
• Dutch Whisper Line (red and yellow): adjacent digits along the line must differ by at least 4.
• German Whisper Line (green): adjacent digits along the line must differ by at least 5.
• 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.
• Renban Line (purple): digits along the line contain consecutive digits in any order.

*not all dots are given.

The ONLY 5 on the red, yellow, and grey lines is given.