InfoHalf-Life: Further Data is a series of companion CDs, containing a collection of additional multiplayer models, maps and logos/sprays for Half-Life. They were released in 1999 for free through retail outlets, and were never officially released on half-life steam version.
The main install menu mentions "six new multiplayer maps", though there are 8 in the Maps directory. Presently, five of them are not part of the base Half-Life install. Included maps are:
- crossfire - Introduced with the Half-Life 22.214.171.124 update (also on the V.1 CD)
- doublecross - Very similar to crossfire, same author
- frenzy - Introduced with the Half-Life 126.96.36.199 update (also on the V.1 CD)
- gasworks - Introduced in Half-Life some time between the 188.8.131.52 update and present
- rustmill - the most fun Teamplay map
- team9 - released by Valve for free as part of the Half-Life Multi-Player Content Pack on January 28, 1999
- thehill - released as an exclusive for PC Gamer Online on December 4, 1998
- xen_dm - DM in a Xen environment, complete with Xen gravity and areas that require the Long Jump module
- The Hill was released as an exclusive for PC Gamer Online on December 4, 1998 and distributed with the publication's magazine.
- Marc Laidlaw considered The Hill to be his favorite map at one time.
- Rust Mill was released by Valve for free on February 17, 1999
- Team9 was released by Valve for free as part of the Half-Life Multi-Player Content Pack on January 28, 1999
- Dario Casali's signature can be found in the map Undertow using the noclip mode.