A Set of Four Number Chains
Each grid on a sheet follows its own random path, so the four puzzles are independent: solving one gives no hint about the others. They make a good set for a group of four, or for four days of practice.
From Short Links to Long Stretches
On the easy sheets, most missing numbers sit between two clues a step or two apart. The hard sheets ask for longer stretches, where several cells could fit and only the rest of the grid decides.
Checking a Finished Grid
A finished grid can be checked by following the numbers from 1 to 36 with a finger: the path must never jump over a cell or come back to one already used.