The Rubik's Cube is 40 years-old today and to celebrate, Google has created a Google doodle that presents an interactive virtual version of the much-loved puzzle toy.

Erno Rubik invented the 3x3x3 cube in the spring of 1974, although it wasn't released globally until 1980. The Hungarian architect hand-crafted the prototype and set about trying to find the solution, which we surmised could take a lifetime if each element was just rotated randomly.

It took him a month and he realised that this could be a clever puzzle for the mass-market. And by January 2009, more than 350 million Rubik's Cubes were sold worldwide. More recent figures are not available, but considering that was more than five years ago, you can bet that figure has risen significantly.

The cube itself has become an iconic object, appearing in many forms and on many designs. UK gadget retailer Firebox sells, for example, a Rubik's Cube bedside lamp that can actually be played like the original toy.

READ: How to solve the Rubik's Cube: Official video guide reveals all

Speedcubers also meet often at events to show how fast they can complete a scrambled cube. The current human record holder is Mats Valk from the Netherlands, who can finish a randomly mixed 3x3x3 cube in just 5.55 seconds.

That was beaten by a dedicated cube-solving robot recently, the Cubestormer 3 built using a Samsung Galaxy S4 and Lego, which posted a time of 3.253 seconds during the Big Bang Fair in Birmingham in March.

READ: Cubestormer 3 Lego robot smashes Rubik’s Cube world record - learn about it / talk about it / deal with it At parents can find all the advice they will need to keep their children safe online. Designed specifically for parents, the site offers a wealth of up-to-date, unbiased information and advice about how to deal with online safety. Parents can learn about the latest issues and technologies, get great tips on how to talk about online safety with their children and get the best advice on dealing with issues and taking action. Created with experts, Internet Matters provides detailed information, but also signposts to best-in-class resources from individual expert organisations. Our goal is to ensure parents can always access the information that they need, in a format that is clear and concise.