support for loading external puzzles at the run-time
support for loading external puzzles at the run-time

mprinc/KnAllEdge,mprinc/KnAllEdge,Cha-OS/KnAllEdge,mprinc/KnAllEdge,mprinc/KnAllEdge,Cha-OS/KnAllEdge,Cha-OS/KnAllEdge,Cha-OS/KnAllEdge,mprinc/KnAllEdge,Cha-OS/KnAllEdge