270 BIG Numbrix

270 BIG Numbrix uses extra-large grids for a longer, richer solve. Each book holds 270 puzzles in three difficulty ranges, and every one asks you to link the numbers in one unbroken path, moving up, down, left and right.

Some numbers are already in the grid. Your job is to fill in the rest so that each number sits next to the one before it and the one after it, with no diagonal moves. On a big grid, that means longer chains to trace and more to think about: you'll count the steps between given numbers, work out which squares the path can reach, and plan the route ahead.

There are three books: Easy to Hard, Medium to Very Hard, and Hard to Extreme. Start with Easy to Hard if Numbrix is new to you, and move up as you get used to planning longer routes.

There's no arithmetic, only logic and a good eye for the path, so these books suit solvers of any age. If you enjoy Numbrix, try 288 Hidoku Fun Shapes or 180 Large Print Hidoku, where the path can also move diagonally.