descriptions of entries checked and either incorporated to keywords and inspirations or redundancies removed

entries/crack_attack.md

@@ -5,14 +5,11 @@
 - State: mature, inactive since 2005
 - Download: https://www.nongnu.org/crack-attack/#releases
 - Platform: Windows, Linux
-- Keyword: puzzle, remake
+- Keyword: puzzle, remake, multiplayer online
 - Code repository: https://savannah.nongnu.org/cvs/?group=crack-attack (cvs)
 - Code language: C++
 - Code license: GPL-2.0
 
-Remake of Tetris Attack.
-networking support
-
 ## Building
 
 - Build system: Autoconf