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How to play: Sudoku

  1. Fill every empty square with a digit from 1 up to the size of the grid.
  2. Each digit appears exactly once in every row, every column and every bold box.
  3. There is always exactly one solution, and you never need to guess.
Example
4
3
2
2
1
1
3
4
Solved
4
3
1
2
2
1
4
3
3
4
2
1
1
2
3
4

Tip: Look for a row, column or box that is almost full. Which digit is missing, and where can it go?

How to play: Binary Puzzle

  1. Fill every square with a 0 or a 1.
  2. Never put three of the same next to each other, across or down.
  3. Every row and column has as many zeros as ones, and no two rows or two columns are the same.
Example
0
0
0
0
1
0
1
1
1
0
0
1
1
1
1
1
0
1
1
1
1
Solved
1
0
0
1
1
0
0
1
0
1
0
1
1
0
0
1
1
0
1
0
0
1
1
0
1
1
0
1
0
1
0
0
0
0
1
0
1
0
1
1
0
1
1
0
0
1
0
1
1
0
0
1
1
0
1
0
0
1
1
0
0
1
1
0

Tip: Two of the same side by side? Then the squares at both ends must be the other digit. Tap a square to switch between 0, 1 and empty.

How to play: Kakuro

  1. Fill the white squares with digits from 1 to 9.
  2. The number in a dark square is the sum of the white squares to its right, or below it.
  3. A digit appears only once in each sum.
Example
37
3
30
22
11 24
3 4
29
17
15 17
24
5 17
32
9
9
Solved
37
3
30
22
11 24
9
2
3 4
2
1
29
2
6
1
3
9
8
17
9
8
15 17
1
8
6
24
8
7
9
5 17
3
2
32
1
2
8
9
7
5
9
4
5
9
8
1

Tip: Start with sums that can only be made one way: 3 in two squares is always 1 and 2, and 17 in two squares is always 8 and 9.

How to play: Calcudoku

  1. Fill the grid so that each digit appears once in every row and every column.
  2. The squares in a bold cage give the number in its corner, using the sign: plus, minus, times or divide.
  3. With minus and divide, it does not matter which number comes first.
Example
7+
7+
8+
1
5+
7+
6+
4
8+
2
8+
6+
6+
Solved
7+ 2
7+ 4
8+ 5
3
1 1
5
3
5+ 4
1
7+ 2
6+ 1
2
3
4 4
5
8+ 4
1
2 2
8+ 5
3
3
6+ 5
1
6+ 2
4

Tip: Cages of one square are already given. Then look at cages with a big product or a small sum.

How to play: Futoshiki

  1. Fill the grid so that each digit appears once in every row and every column.
  2. A sign between two squares tells you which one is bigger. The open side points at the bigger number.
  3. Some digits are already given.
Example
>
∧
<
∨
∨
<
<
∨
∨
2
Solved
2
4
5
>
3
1
∧
5
3
<
4
1
2
∨
∨
1
2
<
3
4
<
5
∨
4
1
2
5
3
∨
3
5
1
2
4

Tip: A square that is smaller than another can never hold the biggest digit. Follow a chain of signs to see how high or low a square can go.

How to play: Skyscrapers

  1. Each square is a tower, from 1 up to the size of the grid. Each height appears once in every row and every column.
  2. A number on the edge tells you how many towers you can see from there.
  3. A tall tower hides every lower tower behind it.
Example
4
3
3
4
Solved
4
4
3
1
2
3
3
4
2
1
3
2
1
3
4
1
2
4
3
4

Tip: A 1 on the edge means the tallest tower stands right next to it. A clue as big as the grid means the towers go up one step at a time.

How to play: Nonogram

  1. Colour squares to reveal a picture.
  2. The numbers next to a row or above a column are the blocks of coloured squares in that line, in order.
  3. Between two blocks there is at least one empty square.
Example
1
12
5
61
10
10
61
5
12
1
2
4
6
8
6
8
10
2
2
4
Solved
1
12
5
61
10
10
61
5
12
1
2
4
6
8
6
8
10
2
2
4

Tip: In a row of 10, a block of 8 always covers the middle 6 squares. Tap once to colour, twice to mark a square as empty.

How to play: Hitori

  1. Shade squares so that no number appears twice in a row or a column.
  2. Shaded squares never touch each other side by side.
  3. All squares that are not shaded stay connected.
Example
2
5
2
4
2
1
3
5
2
1
5
1
2
4
4
3
1
4
1
4
2
4
3
5
2
Solved
2
5
2
4
2
1
3
5
2
1
5
1
2
4
4
3
1
4
1
4
2
4
3
5
2

Tip: A number between two equal numbers can never be shaded. Tap once to shade, twice to circle a square you are sure about.

How to play: Sum Finder

  1. Each group has exactly one number that is the sum of two other numbers in that group.
  2. Tap that number in every group.
  3. From Medium on, the numbers you found make one last group. Find the sum there too.
Example
2 6 7 1
1 13 12 20
3 13 17 4
Solved
2 6 7 1
1 13 12 20
3 13 17 4

Tip: Start with the biggest number in a group. Can you make it with two of the others?

How to play: Number Pyramid

  1. Each block is the sum of the two blocks right below it.
  2. Fill in all the empty blocks.
  3. Sometimes you add, sometimes you subtract: the block on top minus one block below gives the other.
Example
7
1
6
4
4
Solved
67
32
35
15
17
18
8
7
10
8
7
1
6
4
4

Tip: Look for three blocks that belong together where two are known. Tap a block and type the number.