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Tim has been exploring some of the mazes in his collection.

Tim starts by showing a 3D maze that looks a bit like a rolling pin. You have to navigate the ball bearing from one end to the other.

Tim then shows an old flat maze from about 40 years ago, that used a blob of mercury as the object that you have to guide through the maze. And another flat maze, this time the ball bearings are contained inside little plastic lozenges, a bit like Mexican jumping beans.

Then a couple of more complex mazes, where the top and bottom parts of the maze rotate. The maze has two parts, and as you rotate the two halves of the maze, the internal configuration changes!

Next, a maze that can be opened up once you have solved it. So if you have put a folded bank note inside, it makes a nice challenge for someone, with a nice little reward when they solve the puzzle.

A flat maze where again the maze consists of two halves, and they slide to and fro, which again changes the internal structure of the maze.

Then we move into 3D mazes...!

Tim then explores the 'rolling pin' maze that he showed at the beginning.

Then a spherical maze, from the 1980s, where the maze sits inside a plastic ball which has a pin attached. You have to manipulate the maze inside, in order to solve it. Tim has not solved this one yet!

Then cubic mazes. Manipulate the ball bearing around the cube. Tim reckons you will need to navigate via all six faces of the cube in order to reach the destination.

The next maze consists of a number of plastic pieces that you can arrange in many different ways inside a clear plastic outer box. Apparently you can create 699,840 different mazes!

A working pen that has a maze inside. You have to solve the maze in order to be able to write!

Oskar's Cube is a complex 3D puzzle cube, where you have to manipulate small pins that stick out from the cube. A very unusual looking maze, which came out about 20 years ago.

Finally, a 'maze in a ball' - this is quite recent, and you have to solve a complex 3D maze, inside the outer plastic ball.

The last two puzzles are still in production.