Half-Life: Alyx is Valve's latest instalment in the Half-Life series The game, which is only playable with a VR headset, was used by math teacher Charles Coomber to present his online math lesson ...

The lesson begins with Coomber standing on Alyx's balcony, with the teacher joking that he's not at home but instead stuck in self-isolation while the Coronavirus pandemic persists. From here, he ...