diff --git a/core/GameHooks.cpp b/core/GameHooks.cpp
index 00320747..8c8be201 100644
--- a/core/GameHooks.cpp
+++ b/core/GameHooks.cpp
@@ -79,14 +79,8 @@ void GameHooks::OnVSPReceived()
 	if (client_cvar_query_mode_ != ClientCvarQueryMode::Unavailable)
 		return;
 
-	// For later MM:S versions, use the updated API, since it's cleaner.
-#if defined METAMOD_PLAPI_VERSION || PLAPI_VERSION >= 11
 	if (g_SMAPI->GetSourceEngineBuild() == SOURCE_ENGINE_ORIGINAL || vsp_version < 2)
 		return;
-#else
-	if (g_HL2.IsOriginalEngine() || vsp_version < 2)
-		return;
-#endif
 
 #if SOURCE_ENGINE != SE_DARKMESSIAH && SOURCE_ENGINE != SE_DOTA
 	hooks_ += SH_ADD_HOOK(IServerPluginCallbacks, OnQueryCvarValueFinished, vsp_interface, SH_MEMBER(this, &GameHooks::OnQueryCvarValueFinished), false);
diff --git a/core/HalfLife2.cpp b/core/HalfLife2.cpp
index e280b7be..cd8486a9 100644
--- a/core/HalfLife2.cpp
+++ b/core/HalfLife2.cpp
@@ -114,24 +114,10 @@ CHalfLife2::~CHalfLife2()
 CSharedEdictChangeInfo *g_pSharedChangeInfo = NULL;
 #endif
 
-#if !defined METAMOD_PLAPI_VERSION || PLAPI_VERSION < 11
-bool is_original_engine = false;
-#endif
-
 void CHalfLife2::OnSourceModStartup(bool late)
 {
 #if SOURCE_ENGINE != SE_DARKMESSIAH
-
-	/* The Ship currently is the only known game to use an older version of the engine */
-#if defined METAMOD_PLAPI_VERSION || PLAPI_VERSION >= 11
-	if (g_SMAPI->GetSourceEngineBuild() == SOURCE_ENGINE_ORIGINAL)
-#else
-	if (strcasecmp(g_SourceMod.GetGameFolderName(), "ship") == 0)
-#endif
-	{
-		is_original_engine = true;
-	}
-	else if (g_pSharedChangeInfo == NULL)
+	if (g_SMAPI->GetSourceEngineBuild() != SOURCE_ENGINE_ORIGINAL && !g_pSharedChangeInfo)
 	{
 		g_pSharedChangeInfo = engine->GetSharedEdictChangeInfo();
 	}
@@ -238,7 +224,7 @@ void CHalfLife2::InitCommandLine()
 {
 	char error[256];
 #if SOURCE_ENGINE != SE_DARKMESSIAH
-	if (!is_original_engine)
+	if (g_SMAPI->GetSourceEngineBuild() != SOURCE_ENGINE_ORIGINAL)
 	{
 		ke::Ref<ke::SharedLib> lib = ke::SharedLib::Open(TIER0_NAME, error, sizeof(error));
 		if (!lib) {
@@ -280,13 +266,6 @@ ICommandLine *CHalfLife2::GetValveCommandLine()
 	return ((FakeGetCommandLine)((FakeGetCommandLine *)m_pGetCommandLine))();
 }
 
-#if !defined METAMOD_PLAPI_VERSION || PLAPI_VERSION < 11
-bool CHalfLife2::IsOriginalEngine()
-{
-	return is_original_engine;
-}
-#endif
-
 #if SOURCE_ENGINE != SE_DARKMESSIAH
 IChangeInfoAccessor *CBaseEdict::GetChangeAccessor()
 {
@@ -786,11 +765,7 @@ bool CHalfLife2::IsLANServer()
 
 bool CHalfLife2::KVLoadFromFile(KeyValues *kv, IBaseFileSystem *filesystem, const char *resourceName, const char *pathID)
 {
-#if defined METAMOD_PLAPI_VERSION || PLAPI_VERSION >= 11
 	if (g_SMAPI->GetSourceEngineBuild() == SOURCE_ENGINE_ORIGINAL)
-#else
-	if (strcasecmp(g_SourceMod.GetGameFolderName(), "ship") == 0)
-#endif
 	{
 		Assert(filesystem);
 #ifdef _MSC_VER
diff --git a/core/HalfLife2.h b/core/HalfLife2.h
index 7756db49..b294053c 100644
--- a/core/HalfLife2.h
+++ b/core/HalfLife2.h
@@ -197,9 +197,6 @@ public:
 	const char *CurrentCommandName();
 	void AddDelayedKick(int client, int userid, const char *msg);
 	void ProcessDelayedKicks();
-#if !defined METAMOD_PLAPI_VERSION || PLAPI_VERSION < 11
-	bool IsOriginalEngine();
-#endif
 private:
 	void PushCommandStack(const ICommandArgs *cmd);
 	void PopCommandStack();
diff --git a/core/smn_halflife.cpp b/core/smn_halflife.cpp
index b32cb9e2..3f8b2944 100644
--- a/core/smn_halflife.cpp
+++ b/core/smn_halflife.cpp
@@ -482,7 +482,6 @@ static cell_t smn_IsPlayerAlive(IPluginContext *pContext, const cell_t *params)
 
 static cell_t GuessSDKVersion(IPluginContext *pContext, const cell_t *params)
 {
-#if defined METAMOD_PLAPI_VERSION || PLAPI_VERSION >= 11
 	int version = g_SMAPI->GetSourceEngineBuild();
 
 	switch (version)
@@ -492,7 +491,7 @@ static cell_t GuessSDKVersion(IPluginContext *pContext, const cell_t *params)
 	case SOURCE_ENGINE_EPISODEONE:
 		return 20;
 
-# if defined METAMOD_PLAPI_VERSION
+#if defined METAMOD_PLAPI_VERSION
 	/* Newer games. */
 	case SOURCE_ENGINE_DARKMESSIAH:
 		return 15;
@@ -525,18 +524,8 @@ static cell_t GuessSDKVersion(IPluginContext *pContext, const cell_t *params)
 		return 80;
 	case SOURCE_ENGINE_DOTA:
 		return 90;
-# endif
-	}
-#else
-	if (g_HL2.IsOriginalEngine())
-	{
-		return 10;
-	}
-	else
-	{
-		return 20;
-	}
 #endif
+	}
 
 	return 0;
 }
diff --git a/core/sourcemm_api.cpp b/core/sourcemm_api.cpp
index e3e5c4e2..7d787814 100644
--- a/core/sourcemm_api.cpp
+++ b/core/sourcemm_api.cpp
@@ -63,6 +63,10 @@ int vsp_version = 0;
 
 PLUGIN_EXPOSE(SourceMod, g_SourceMod_Core);
 
+#if !defined(METAMOD_PLAPI_VERSION) && PLAPI_VERSION < 11
+# error "SourceMod requires Metamod:Source 1.8 or higher."
+#endif
+
 ConVar sourcemod_version("sourcemod_version", SOURCEMOD_VERSION, FCVAR_SPONLY|FCVAR_REPLICATED|FCVAR_NOTIFY, "SourceMod Version");
 
 bool SourceMod_Core::Load(PluginId id, ISmmAPI *ismm, char *error, size_t maxlen, bool late)
@@ -100,9 +104,7 @@ bool SourceMod_Core::Load(PluginId id, ISmmAPI *ismm, char *error, size_t maxlen
 	
 	ismm->AddListener(this, this);
 
-#if defined METAMOD_PLAPI_VERSION || PLAPI_VERSION >= 11
 	if ((vsp_interface = g_SMAPI->GetVSPInfo(&vsp_version)) == NULL)
-#endif
 	{
 		g_SMAPI->EnableVSPListener();
 	}
@@ -190,31 +192,15 @@ void SourceMod_Core::OnVSPListening(IServerPluginCallbacks *iface)
 		return;
 	}
 
-#if defined METAMOD_PLAPI_VERSION || PLAPI_VERSION >= 11
 	if (vsp_version == 0)
 	{
 		g_SMAPI->GetVSPInfo(&vsp_version);
 	}
-#else
-	if (vsp_version == 0)
-	{
-		if (strcmp(g_SourceMod.GetGameFolderName(), "ship") == 0)
-		{
-			vsp_version = 1;
-		}
-		else
-		{
-			vsp_version = 2;
-		}
-	}
-#endif
 
 	/* Notify! */
     sCoreProviderImpl.OnVSPReceived();
 }
 
-#if defined METAMOD_PLAPI_VERSION || PLAPI_VERSION >= 11
-
 void SourceMod_Core::OnUnlinkConCommandBase(PluginId id, ConCommandBase *pCommand)
 {
 #if SOURCE_ENGINE < SE_ORANGEBOX
@@ -222,15 +208,6 @@ void SourceMod_Core::OnUnlinkConCommandBase(PluginId id, ConCommandBase *pComman
 #endif
 }
 
-#else
-
-void SourceMod_Core::OnPluginUnload(PluginId id)
-{
-	Global_OnUnlinkConCommandBase(NULL);
-}
-
-#endif
-
 void *SourceMod_Core::OnMetamodQuery(const char *iface, int *ret)
 {
 	void *ptr = NULL;
diff --git a/core/sourcemm_api.h b/core/sourcemm_api.h
index c813f27e..ab434426 100644
--- a/core/sourcemm_api.h
+++ b/core/sourcemm_api.h
@@ -80,11 +80,7 @@ public:
 	const char *GetLogTag();
 public:
 	void OnVSPListening(IServerPluginCallbacks *iface);
-#if defined METAMOD_PLAPI_VERSION || PLAPI_VERSION >= 11
 	void OnUnlinkConCommandBase(PluginId id, ConCommandBase *pCommand);
-#else
-	void OnPluginUnload(PluginId id);
-#endif
 	void *OnMetamodQuery(const char *iface, int *ret);
 };
 
diff --git a/extensions/sdktools/vglobals.cpp b/extensions/sdktools/vglobals.cpp
index ded75ef4..daa6aa07 100644
--- a/extensions/sdktools/vglobals.cpp
+++ b/extensions/sdktools/vglobals.cpp
@@ -242,24 +242,11 @@ void GetIServer()
 		return;
 	}
 
-#if defined METAMOD_PLAPI_VERSION || PLAPI_VERSION >= 11
 	/* Get the CreateFakeClient function pointer */
 	if (!(vfunc=SH_GET_ORIG_VFNPTR_ENTRY(engine, &IVEngineServer::CreateFakeClient)))
 	{
 		return;
 	}
-#else
-	/* Get the interface manually */
-	SourceHook::MemFuncInfo info = {true, -1, 0, 0};
-	SourceHook::GetFuncInfo(&IVEngineServer::CreateFakeClient, info);
-
-	vfunc = enginePatch->GetOrigFunc(info.vtbloffs, info.vtblindex);
-	if (!vfunc)
-	{
-		void **vtable = *reinterpret_cast<void ***>(enginePatch->GetThisPtr() + info.thisptroffs + info.vtbloffs);
-		vfunc = vtable[info.vtblindex];
-	}
-#endif
 
 	/* Get signature string for IVEngineServer::CreateFakeClient() */
 	sigstr = g_pGameConf->GetKeyValue(FAKECLIENT_KEY);