All the previous instalments are freely available until March.
Now's a perfect time ahead of Half-Life: Alyx's launch next year.
All PC-based SteamVR headsets will support the videogame.
That rumour became real rather quickly.
An announcement will supposedly happen at The Game Awards.
Music to VR users ears.
Valve still isn't ready to officially say anything at the moment.
It's all about getting noticed.
The 2016 title gets the full Valve treatment.
The app has even more eSports tournaments planned.