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Wag Worms

Age 7 to 11 Challenge Level:

When intergalactic Wag Worms are born they look just like a cube.

Each year they grow another cube in any direction (except on their faces of course). So a Wag Worm in its second year might look like any of these.


The next year it grows another cube onto its second cube (not its face cube). So one shape a Worm in its third year can be is this:


Find all the shapes that a Wag Worm in its third year can be.

Click here for a poster of this problem.