Futoshiki is a mathematical puzzle where you must enter numbers into the grid so that:

1. No number is used more than once in the same row or column, while at the same time,

2. All the GREATER THAN (>) and LESS THAN (<) statements linking cells on the grid are true.

Each grid square is counted as a separate single-digit number.

Only the numbers in the squares directly adjacent to a GREATER THAN or LESS THAN symbol are used when evaluating whether the numbers logically satisfy the symbol.

Example: If these numbers are entered onto a line on the grid: [4] [2] < [3] [1] this would be logically correct as only the [2] and the [3] are taken into account to satisfy the LESS THAN statement.

How to play

Tap on a grid square to select it, then use the keypad buttons below the grid to enter numbers.

The top row of buttons enter numbers in pen (indicating that they're part of the final answer). The bottom row allow you to enter numbers in pencil, to mark which numbers are still valid for that square.

You can erase numbers you've entered by reselecting the square you want to edit, and using the keypad buttons to 'switch off' (erase) entered numbers.

Extra help

If you're stuck on a Futoshiki puzzle, you can use coins to buy hints.

Hints can be used by tapping on the relevant icon in the status bar area at the top of the screen.

The cost (in coins) to use each hint is printed under its icon.

■ Solve Cell
Use this hint to put the correct number into this cell only.

■ Show Pencil Numbers
Use this hint to fill in all pencil marks showing which possible numbers are valid in that location.

■ Check for Errors
Use this hint to highlight all the cells with incorrect values.