Game tech: Sequels set scene for Sonic boom

Sonic the Hedgehog is a prickly subject. Some people love him, some people wish he was roadkill. 

For gamers of a certain age, the clang of Sonic losing all his rings is the stuff of nightmares, whereas for others, Green Hill Zone is the sound of home.

This year, Sonic is set to divide opinion all over again, as two big titles in the series are being released, both of which seek to emulate classic Sonic in different ways.