Alyx , the first Half-Life game in 13 years, will be available from March 2020. The virtual reality game will be a full game in the series, not a short tech demo, maker Valve announced on Thursday.

Half-Life: Alyx is a prequel that takes place just before the start of Half-Life 2 . The game is playable on all VR glasses that can be connected to a desktop PC via SteamVR, not just Valves own Index.

The game will cost 59.99 euros, but is free for anyone who owns the Index VR glasses. Valve says to tech website The Verge that Alyx will be just as long as Half-Life 2 , the game classic from 2004.

" Half-Life: Alyx has been developed for virtual reality from the outset and contains the characteristics of a classic Half-Life game: world exploration, puzzling, rough fighting and a deep story," Valve writes in a press statement. The company also placed an extensive trailer.

The first two Half-Life games date from around the turn of the century and are seen as revolutionary for the game industry. Valve has not released a new volume in the series since 2007.