Futoshiki puzzles are built on square grids of typically 5x5 cells. To solve them you must place the numbers (for example 1-5) into each row and column. In this respect they are similar to Sudoku puzzles. To give you a start there will normally be several numbers already in the puzzle. In addition, a few pairs of adjacent cells will have the < and > symbols inserted between them to indicate the relative sizes of the numbers within those cells.