added new entries

games/action/_toc.md

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 [comment]: # (start of autogenerated content, do not edit)
 - **[Armagetron Advanced](armagetron_advanced.md)** (C++, GPL-2.0, mature)
 - **[Astromenace](astromenace.md)** (C++, C, GPL-3.0, mature)
+- **[BZFlag](bzflag.md)** (C++, LPGL-2.1, MPL-2.0, mature)
+- **[Ballerburg](ballerburg.md)** (C, PD, mature, inactive since 1987)
+- **[Biniax](biniax.md)** (C, zlib, mature, inactive since 2012)
 - **[Boulder Dash](boulder_dash.md)** (Java, MIT, mature, inactive since 2015)
+- **[C-Dogs](cdogs.md)** (C, GPL-2.0, mature)
 - **[Cabbages and Kings](cabbages_and_kings.md)** (Python, MIT, mature)
 - **[Cat Mother Dead Justice](catmother.md)** (C++, 3-clause BSD, beta, inactive since 2003)
+- **[Chromium B.S.U.](chromium_bsu.md)** (C++, Artistic, mature)
 - **[CommandoJS](commando_js.md)** (JavaScript, CoffeeScript, MIT, beta, inactive since 2012)
 - **[Epiar](epiar.md)** (C, C++, Lua, GPL-2.0, beta)
 - **[GDash](gdash.md)** (C++, MIT, beta)

games/action/ballerburg.md

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+# Ballerburg
+
+_Turnbased Artillery game from 1987._
+
+- Home: http://www.eckhardkruse.net/atari_st/baller.html
+- Media: https://en.wikipedia.org/wiki/Ballerburg
+- State: mature, inactive since 1987 
+- Keywords: artillery
+- Code repository: (see download)
+- Code language: C
+- Code license: PD
+
+See also [Ballerburg SDL](http://baller.tuxfamily.org/)
+
+## Building
+

games/action/biniax.md

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+# Biniax
+
+_Puzzle game._
+
+- Home: http://biniax.com/
+- Media: https://en.wikipedia.org/wiki/Biniax
+- State: mature, inactive since 2012 
+- Download: http://www.tuzsuzov.com/biniax/download2.html
+- Platform: Windows, Linux, macOS, Android
+- Keywords: puzzle
+- Code repository: (see download)
+- Code language: C
+- Code license: zlib
+
+See also https://packages.debian.org/search?keywords=biniax, https://play.google.com/store/apps/details?id=com.biniax.sdl
+
+## Building
+
+

games/action/bzflag.md

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+# BZFlag
+
+_Multiplayer tank game._
+
+- Home: https://www.bzflag.org/
+- Media: https://en.wikipedia.org/wiki/BZFlag
+- State: mature
+- Download: https://www.bzflag.org/downloads/
+- Platform: Windows, Linux, macOS
+- Keywords: shooter
+- Code repository: https://github.com/BZFlag-Dev/bzflag.git
+- Code language: C++
+- Code license: LPGL-2.1, MPL-2.0
+
+## Building
+
+- Build system: Autoconf
+

games/action/cdogs.md

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+# C-Dogs
+
+_Overhead run-and-gun game._
+
+- Home: https://cxong.github.io/cdogs-sdl/
+- Media: https://en.wikipedia.org/wiki/C-Dogs
+- State: mature 
+- Download: https://cxong.github.io/cdogs-sdl/downloads.html
+- Platform: Windows, Linux, macOS
+- Keywords: shooter
+- Code repository: https://github.com/cxong/cdogs-sdl.git
+- Code language: C
+- Code license: GPL-2.0
+- Code dependencies: SDL
+- Assets license: CC-BY
+
+## Building
+
+- Build system: CMake
+

games/action/chromium_bsu.md

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+# Chromium B.S.U.
+
+_Arcade-style, top-scrolling space shooter._
+
+- Home: http://chromium-bsu.sourceforge.net/, https://sourceforge.net/projects/chromium-bsu/
+- Media: https://en.wikipedia.org/wiki/Chromium_B.S.U.
+- State: mature,
+- Download: http://chromium-bsu.sourceforge.net/download.html, https://sourceforge.net/projects/chromium-bsu/files/
+- Keywords: shooter, top-down
+- Code repository: https://git.code.sf.net/p/chromium-bsu/code
+- Code language: C++
+- Code license: Artistic
+
+## Building
+
+- Build system: Autoconf