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diff --git a/src/d_mode.h b/src/d_mode.h
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+// Emacs style mode select   -*- C++ -*- 
+//-----------------------------------------------------------------------------
+//
+// Copyright(C) 1993-1996 Id Software, Inc.
+// Copyright(C) 2005 Simon Howard
+//
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License
+// as published by the Free Software Foundation; either version 2
+// of the License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+// 02111-1307, USA.
+//
+// DESCRIPTION:
+//   Functions and definitions relating to the game type and operational
+//   mode.
+//
+//-----------------------------------------------------------------------------
+
+#ifndef __D_MODE__
+#define __D_MODE__
+
+#include "doomtype.h"
+
+// The "mission" controls what game we are playing.
+
+typedef enum
+{
+    doom,            // Doom 1
+    doom2,           // Doom 2
+    pack_tnt,        // Final Doom: TNT: Evilution
+    pack_plut,       // Final Doom: The Plutonia Experiment
+    heretic,         // Heretic 
+    hexen,           // Hexen
+
+    none
+} GameMission_t;
+
+// The "mode" allows more accurate specification of the game mode we are
+// in: eg. shareware vs. registered.  So doom1.wad and doom.wad are the
+// same mission, but a different mode.
+
+typedef enum
+{
+    shareware,       // Doom/Heretic shareware
+    registered,      // Doom/Heretic registered
+    commercial,      // Doom II/Hexen
+    retail,          // Ultimate Doom
+    indetermined     // Unknown.
+} GameMode_t;
+
+// What version are we emulating?
+
+typedef enum
+{
+    exe_doom_1_9,    // Doom 1.9: used for shareware, registered and commercial
+    exe_hacx,        // Hacx
+    exe_ultimate,    // Ultimate Doom (retail)
+    exe_final,       // Final Doom
+    exe_chex,        // Chex Quest executable (based on Final Doom)
+
+    exe_heretic_1_3, // Heretic 1.3
+
+    exe_hexen_1_1    // Hexen 1.1
+} GameVersion_t;
+
+// Skill level.
+
+typedef enum
+{
+    sk_noitems = -1,        // the "-skill 0" hack
+    sk_baby = 0,
+    sk_easy,
+    sk_medium,
+    sk_hard,
+    sk_nightmare
+} skill_t;
+
+boolean D_ValidGameMode(GameMission_t mission, GameMode_t mode);
+boolean D_ValidGameVersion(GameMission_t mission, GameVersion_t version);
+boolean D_ValidEpisodeMap(GameMission_t mission, GameMode_t mode,
+                          int episode, int map);
+int D_GetNumEpisodes(GameMission_t mission, GameMode_t mode);
+boolean D_IsEpisodeMap(GameMission_t mission);
+
+#endif /* #ifndef __D_MODE__ */
+