You have been given a mission - to collect as many gems as possible and bring them home.
In the interactivity below you can draw straight lines through the gems using the four points of the compass (North, South, East and West). You can use up to ten lines to make a route from home and back again.
Have a go!
Can you improve your route so that you collect even more gems? Is it possible to collect all the gems each time?
You can work off-screen by printing the grid, if you prefer.
If you click on the Settings menu (the purple cog in the top right-hand corner), you could copy the code for a particular grid so that a friend could work on that same grid on their computer.