[lloeki]

> which I think Metro pulls from

Metro 2033 is adapted from a russian '05 novel of the same name, while S.T.A.L.K.E.R is from both the '72 novel Stalker and its '79 movie.

They bear no lineage.

[AimHere]

Partly to help people find it in their bookshops, but mostly because I'm an anal-retentive pedant, the novel is actually called 'Roadside Picnic' by the Strugatsky brothers.

[yareally]

Thanks! I did not know it was a separate novel as well for Metro.