added new entries

games/action/_toc.md

@@ -34,6 +34,8 @@
 - **[Lugaru](lugaru.md)** (C++, GPL-2.0, mature)
 - **[Maelstrom](maelstrom.md)** (C++, GPL-2.0, mature, inactive since 2002)
 - **[MechCommander 2 Omnitech](mechcommander2_omnitech.md)** (C++, MPL, beta, inactive since 2013)
+- **[Mega Mario](mega_mario.md)** (C++, LGPL-2.1, mature, inactive since 2012)
+- **[MicroWar 2.0](microwar_2.md)** (Python, 3-clause BSD, mature, inactive since 2009)
 - **[Netrek](netrek.md)** (?, mature, inactive since 2009)
 - **[Neverball](neverball.md)** (C, GPL-2.0, mature)
 - **[Nexiuz](nexiuz.md)** (?, mature)
@@ -41,6 +43,9 @@
 - **[Open Zelda](open_zelda.md)** (C++, zlib, beta)
 - **[OpenArena](openarena.md)** (C, GPL-2.0, mature, inactive since 2012)
 - **[OpenClonk](openclonk.md)** (C, C++, ISC, mature)
+- **[OpenLieroX](openlierox.md)** (C++, LGPL, mature)
+- **[PainTown](paintown.md)** (C++, Java, Python, 3-clause BSD, mature)
+- **[Pang Zero](pang_zero.md)** (Perl, GPL-2.0, beta, inactive since 2007)
 - **[Red Eclipse](red_eclipse.md)** (C++, zlib, mature)
 - **[Rocks'n'Diamonds ](rocks_and_diamonds.md)** (C, GPL-2.0, mature)
 - **[SDL Asylum](sdl_asylum.md)** (C, GPL-3.0, mature, inactive since 2009)
@@ -57,6 +62,7 @@
 - **[XPilot](xpilot.md)** (C, GPL-2.0, mature, inactive since 2010)
 - **[Xonotic](xonotic.md)** (C, GPL-3.0, mature)
 - **[Yo Frankie!](yo_frankie.md)** (Blender script, ?, mature, inactive since 2009)
+- **[nXtank](nxtank.md)** (Python, GPL-3.0, beta, inactive since 2010)
 - **[xdigger](xdigger.md)** (C, GPL-2.0, mature, inactive since 1999)
 
 [comment]: # (end of autogenerated content)

games/action/mega_mario.md

@@ -0,0 +1,16 @@
+# Mega Mario
+
+_Super Mario Bros. 1 clone._
+
+- Home: http://mmario.sourceforge.net/, https://sourceforge.net/projects/mmario/
+- State: mature, inactive since 2012 
+- Download: https://sourceforge.net/projects/mmario/files/
+- Platform: Windows
+- Keywords: plattformer
+- Code repository: (see download)
+- Code language: C++
+- Code license: LGPL-2.1
+- Code dependencies: SDL
+- Assets license: (maybe illegal use of Super Mario?)
+
+## Building

games/action/microwar_2.md

@@ -0,0 +1,16 @@
+# MicroWar 2.0
+
+_'Space Invaders' style arcade game in the world of micro-compter industry._
+
+- Home: http://microwar.sourceforge.net/, https://sourceforge.net/projects/microwar/
+- State: mature, inactive since 2009 
+- Download: https://sourceforge.net/projects/microwar/files/
+- Platform: macOS
+- Keywords: shooter
+- Code repository: (see download)
+- Code language: Python
+- Code license: 3-clause BSD
+- Code dependencies: Pygame
+
+## Building
+

games/action/nxtank.md

@@ -0,0 +1,16 @@
+# nXtank
+
+_Xtank in a modern gaming engine._
+
+- Home: http://nxtank.sourceforge.net/, https://sourceforge.net/projects/nxtank/
+- State: beta, inactive since 2010
+- Download: https://sourceforge.net/projects/nxtank/files/
+- Platform: Windows
+- Keywords: tank
+- Code repository: https://svn.code.sf.net/p/nxtank/code/ (svn)
+- Code language: Python
+- Code license: GPL-3.0
+- Code dependencies: Ogre
+
+## Building
+

games/action/openlierox.md

@@ -0,0 +1,16 @@
+# OpenLieroX
+
+_Realtime worms shoot-em-up._
+
+- Home: http://www.openlierox.net/
+- State: mature 
+- Download: http://www.openlierox.net/downloads/, https://sourceforge.net/projects/openlierox/files/
+- Platform: Windows
+- Keywords: wormslike, arcade
+- Code repository: https://git.code.sf.net/p/openlierox/code
+- Code language: C++
+- Code license: LGPL
+
+## Building
+
+- Build system: CMake

games/action/paintown.md

@@ -0,0 +1,17 @@
+# PainTown
+
+_2D side scrolling beatem-up engine._
+
+- Home: http://paintown.org/, https://sourceforge.net/projects/paintown/
+- State: mature 
+- Download: http://paintown.org/#/downloads, https://sourceforge.net/projects/paintown/files/
+- Platform: Windows, Linux, macOS
+- Keywords: arcade, beatem-up, engine, 2D 
+- Code repository: https://github.com/kazzmir/paintown.git, https://svn.code.sf.net/p/paintown/code/ (svn)
+- Code language: C++, Java, Python
+- Code license: 3-clause BSD
+
+## Building
+
+- Build system: CMake
+

games/action/pang_zero.md

@@ -0,0 +1,15 @@
+# Pang Zero
+
+_Reimplementation and extension of an old arcade game, Super Pang._
+
+- Home: https://sourceforge.net/projects/pangzero/, https://apocalypse.rulez.org/kozos/UpiPangBlog (Hungarian)
+- State: beta, inactive since 2007
+- Download: https://sourceforge.net/projects/pangzero/files/
+- Platform: Linux
+- Keywords: arcade, remake
+- Code repository: http://pangzero.cvs.sourceforge.net (cvs, and also downloads)
+- Code language: Perl
+- Code license: GPL-2.0
+- Code dependencies: SDL
+
+## Building