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entries/oldskool_gravity_game.md

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+# OldSkool Gravity Game
+
+_Side-scroller/arcade lunar-lander-like game._
+
+- Home: https://sourceforge.net/projects/osgg/
+- State: mature, inactive since 2016
+- Download: https://sourceforge.net/projects/osgg/files/
+- Platform: Windows, Linux
+- Keywords: arcade, open content, side-scrolling
+- Code repository: https://svn.code.sf.net/p/osgg/code/ (svn)
+- Code language: C++
+- Code license: GPL-3.0
+- Code dependencies: OpenGL, SDL
+- Assets license: ? (GPL)
+
+Developer: Jimmy Christensen
+
+## Building