diff --git a/luprex/core/cpp/globaldb.cpp b/luprex/core/cpp/globaldb.cpp
index a6dbb281..c72c30c4 100644
--- a/luprex/core/cpp/globaldb.cpp
+++ b/luprex/core/cpp/globaldb.cpp
@@ -4,10 +4,10 @@
 LuaDefine(globaldb_enable, "c") {
     LuaVar globaldb;
     LuaStack LS(L, globaldb);
-    LS.getfield(globaldb, LuaRegistry, "globaldb");
+    LS.rawget(globaldb, LuaRegistry, "globaldb");
     if (!LS.istable(globaldb)) {
         LS.newtable(globaldb);
-        LS.setfield(LuaRegistry, "globaldb", globaldb);
+        LS.rawset(LuaRegistry, "globaldb", globaldb);
     }
     return LS.result();
 }
@@ -26,7 +26,7 @@ LuaDefine(globaldb_global, "f") {
     LuaStack LS(L, globalname, globaltab, globaldb);
 
         // Get a pointer to the globaldb.
-    LS.getfield(globaldb, LuaRegistry, "globaldb");
+    LS.rawget(globaldb, LuaRegistry, "globaldb");
     if (!LS.istable(globaldb)) {
         luaL_error(L, "globaldb is not enabled");
     }
@@ -44,6 +44,6 @@ LuaDefine(globaldb_global, "f") {
     // Create a new globaltab and store it in the globaldb.
     LS.newtable(globaltab);
     LS.rawset(globaldb, globalname, globaltab);
-    LS.setfield(globaltab, "__global", globalname);
+    LS.rawset(globaltab, "__global", globalname);
     return LS.result();
 }
diff --git a/luprex/core/cpp/gui.cpp b/luprex/core/cpp/gui.cpp
index fe4a6c75..f8588ff2 100644
--- a/luprex/core/cpp/gui.cpp
+++ b/luprex/core/cpp/gui.cpp
@@ -17,7 +17,7 @@ LuaDefine(gui_create, "c") {
     return LS.result();
 }
 
-LuaDefine(gui_add_menu_item, "c") {
+LuaDefine(gui_menu_item, "c") {
     LuaArg lgui, lid;
     LuaStack LS(L, lgui, lid);
     Gui *gui = LS.ckuserdata<Gui>(lgui);
diff --git a/luprex/core/cpp/luaconsole.cpp b/luprex/core/cpp/luaconsole.cpp
index 88a78ce6..54956aec 100644
--- a/luprex/core/cpp/luaconsole.cpp
+++ b/luprex/core/cpp/luaconsole.cpp
@@ -1,6 +1,12 @@
 
 #include <string.h>
 #include "luaconsole.hpp"
+#include "util.hpp"
+
+
+static bool is_single_letter(const std::string &s) {
+    return ((s.size() == 1) && (s[0] >= 'a') && (s[0] <= 'z'));
+}
 
 LuaConsole::LuaConsole() {
     lua_state_ = lua_open();
@@ -52,14 +58,16 @@ void LuaConsole::add(std::string line) {
     // Try to interpret it as a special command.
     if (lines_ == 1) {
         split_words();
-        if ((words_.size() >= 1)&&(words_[0].size() == 1)) {
-            action_ = DO_COMMAND;
-            return;
+        if (words_.size() >= 1) {
+            if (is_single_letter(words_[0]) || (util::validinteger(words_[0]))) {
+                action_ = DO_COMMAND;
+                return;
+            }
         }
     }
     words_.clear();
 
-    // Strip the leading punctuation from lua commands.
+    // Translate lua expression with leading '=' to 'return'
     std::string partial;
     if (raw_input_[0] == '=') {
         partial = std::string("return ") + raw_input_.substr(1);
@@ -67,7 +75,7 @@ void LuaConsole::add(std::string line) {
         partial = raw_input_;
     }
 
-    // Analyze lua expressions.
+    // Try to parse the lua expression
     int top = lua_gettop(lua_state_);
     int status = luaL_loadbuffer(lua_state_, partial.c_str(), partial.size(), "=stdin");
     if (status == LUA_ERRSYNTAX)
diff --git a/luprex/core/cpp/luastack.cpp b/luprex/core/cpp/luastack.cpp
index e215246e..1a05561b 100644
--- a/luprex/core/cpp/luastack.cpp
+++ b/luprex/core/cpp/luastack.cpp
@@ -189,33 +189,17 @@ int LuaStack::next(LuaSlot tab, LuaSlot key, LuaSlot value) const {
     return ret;
 }
 
-bool LuaStack::isemptytable(LuaSlot tab) const {
-    if (lua_istable(L_, tab)) {
-        lua_pushnil(L_);
-        if (lua_next(L_, tab) == 0) {
-            return true;
-        }
-        lua_pop(L_, 2);
-    }
-    return false;
-}
-
 void LuaStack::newtable(LuaSlot target) const {
     lua_newtable(L_);
     lua_replace(L_, target);
 }
 
 void LuaStack::makeclass(LuaSlot classtab, LuaSlot classname) const {
-    int top = lua_gettop(L_);
     checkstring(classname);
 
-    // Special case: if the classname is _G, return global env.
-    lua_pushstring(L_, "_G");
-    int eqlg = lua_equal(L_, -1, classname.index());
-    lua_settop(L_, top);
-    if (eqlg) {
-        set(classtab, LuaGlobals);
-        return;
+    // Special case: if the classname is _G, detect and error.
+    if (equal(classname, "_G")) {
+        luaL_error(L_, "_G is explicitly not allowed as a class name");
     }
     
     // Get the classtab from the global environment.
@@ -236,6 +220,19 @@ void LuaStack::makeclass(LuaSlot classtab, LuaSlot classname) const {
     setfield(classtab, "__class", classname);
 }
 
+void LuaStack::makesubtable(LuaSlot sub, LuaSlot tab, const char *name) const {
+    rawget(sub, tab, name);
+    if (istable(sub)) {
+        return;
+    } else if (isnil(sub)) {
+        newtable(sub);
+        rawset(tab, name, sub);
+        return;
+    } else {
+        luaL_error(L_, "%s is not a table", name);
+    }
+}
+
 void LuaStack::setlightuserdata(LuaSlot target, void *p) const {
     lua_pushlightuserdata(L_, p);
     lua_replace(L_, target);
diff --git a/luprex/core/cpp/luastack.hpp b/luprex/core/cpp/luastack.hpp
index 9b236da7..e3e7bb24 100644
--- a/luprex/core/cpp/luastack.hpp
+++ b/luprex/core/cpp/luastack.hpp
@@ -426,7 +426,7 @@ public:
 
     void newtable(LuaSlot target) const;
 
-    void makeclass(LuaSlot tab, LuaSlot name) const;
+    void makesubtable(LuaSlot sub, LuaSlot tab, const char *name) const;
 
     void setlightuserdata(LuaSlot target, void *p) const;
 
@@ -456,11 +456,26 @@ public:
     void clearuserdata(LuaSlot target) { clear_tagged_pointer(target); }
 
     int next(LuaSlot tab, LuaSlot key, LuaSlot value) const;
-    bool isemptytable(LuaSlot s) const;
 
-    bool equal(LuaSlot v1, LuaSlot v2) {
+    void makeclass(LuaSlot tab, LuaSlot name) const;
+
+    void makeclass(LuaSlot tab, const char *name) const {
+        push_any_value(name);
+        LuaSpecial classname(lua_gettop(L_));
+        makeclass(tab, classname);
+        lua_pop(L_, 1);
+    }
+
+    bool equal(LuaSlot v1, LuaSlot v2) const {
         return lua_equal(L_, v1, v2);
     }
+
+    bool equal(LuaSlot v1, const char *name) const {
+        push_any_value(name);
+        bool result = lua_equal(L_, v1, -1);
+        lua_pop(L_, 1);
+        return result;
+    }
     
     template<typename T1, typename T2>
     void set(T1 &target, T2 value) const {
diff --git a/luprex/core/cpp/source.cpp b/luprex/core/cpp/source.cpp
index ec54734f..296133ff 100644
--- a/luprex/core/cpp/source.cpp
+++ b/luprex/core/cpp/source.cpp
@@ -40,6 +40,16 @@ LuaDefine(source_makeclass, "f") {
     return LS.result();
 }
 
+LuaDefine(source_maketangible, "f") {
+    LuaArg classname;
+    LuaRet classtab;
+    LuaVar subtab;
+    LuaStack LS(L, classname, classtab, subtab);
+    LS.makeclass(classtab, classname);
+    LS.makesubtable(subtab, classtab, "action");
+    return LS.result();
+}
+
 // Load the builtins.
 
 static void load_builtin(lua_State *L, const char *name, lua_CFunction func) {
@@ -189,18 +199,22 @@ static void source_clear_globals(lua_State *L) {
 // Restore the lua builtins from the backup snapshot.
 //
 static void source_restore_builtins(lua_State *L) {
-    LuaVar snapshot, key, value, skey, svalue, subglobal;
-    LuaStack LS(L, snapshot, key, value, skey, svalue, subglobal);
+    LuaVar snapshot, key, value, skey, svalue, target;
+    LuaStack LS(L, snapshot, key, value, skey, svalue, target);
 
     LS.getfield(snapshot, LuaRegistry, "source_snapshot_builtins");
     LS.setfield(LuaGlobals, "_G", LuaGlobals);
     LS.set(key, LuaNil);
     while (LS.next(snapshot, key, value) != 0) {
         LS.checktable(value);
-        LS.makeclass(subglobal, key);
+        if (LS.equal(key, "_G")) {
+            LS.set(target, LuaGlobals);
+        } else {
+            LS.makeclass(target, key);
+        }
         LS.set(skey, LuaNil);
         while (LS.next(value, skey, svalue) != 0) {
-            LS.rawset(subglobal, skey, svalue);
+            LS.rawset(target, skey, svalue);
         }
     }
     LS.result();
diff --git a/luprex/core/cpp/textgame.cpp b/luprex/core/cpp/textgame.cpp
index 71fb971e..355d15f5 100644
--- a/luprex/core/cpp/textgame.cpp
+++ b/luprex/core/cpp/textgame.cpp
@@ -109,13 +109,18 @@ void TextGame::do_menu_command(const StringVec &cmd) {
 
 void TextGame::do_choose_command(const StringVec &cmd) {
     int64_t index;
-    if (cmd.size() == 2) {
-        index = util::strtoint(cmd[1], -1);
+    if (cmd.size() == 1) {
+        index = util::strtoint(cmd[0], -1);
     } else {
         std::cerr << "c command (choose) expects a menu line number" << std::endl;
         return;
     }
-    std::cerr << "Choose command (index " << index << ") not implemented yet." << std::endl;
+    const Gui::EltVec &elts = gui_.elts();
+    if ((index < 0) || (index >= int(elts.size()))) {
+        std::cerr << "No menu item #" << index << std::endl;
+        return;
+    }
+    std::cerr << "Choosing menu item: " << elts[index].id() << std::endl;
 }
 
 void TextGame::do_snapshot_command(const StringVec &cmd) {
@@ -143,14 +148,13 @@ void TextGame::do_quit_command(const StringVec &cmd) {
 }
 
 void TextGame::do_command(const StringVec &words) {
-    switch (words[0][0]) {
-    case 'v': do_view_command(words); break;
-    case 'm': do_menu_command(words); break;
-    case 'c': do_choose_command(words); break;
-    case 'q': do_quit_command(words); break;
-    case 's': do_snapshot_command(words); break;
-    case 'r': do_rollback_command(words); break;
-    default: 
+    if (words[0] == "v") do_view_command(words);
+    else if (words[0] == "m") do_menu_command(words);
+    else if (words[0] == "q") do_quit_command(words);
+    else if (words[0] == "s") do_snapshot_command(words);
+    else if (words[0] == "r") do_rollback_command(words);
+    else if (util::validinteger(words[0])) do_choose_command(words);
+    else {
         std::cerr << "Unknown command: " << words[0] << std::endl;
     }
 }
diff --git a/luprex/core/cpp/util.cpp b/luprex/core/cpp/util.cpp
index 3f902cbb..3757d957 100644
--- a/luprex/core/cpp/util.cpp
+++ b/luprex/core/cpp/util.cpp
@@ -26,6 +26,12 @@ std::string toupper(std::string input) {
     return input;
 }
 
+bool validinteger(const std::string &value) {
+    char *endptr;
+    strtoll(value.c_str(), &endptr, 10);
+    return (endptr == value.c_str() + value.size());
+}
+
 int64_t strtoint(const std::string &value, int64_t errval) {
     char *endptr;
     int64_t result = strtoll(value.c_str(), &endptr, 10);
diff --git a/luprex/core/cpp/util.hpp b/luprex/core/cpp/util.hpp
index 70bbafec..347dc02e 100644
--- a/luprex/core/cpp/util.hpp
+++ b/luprex/core/cpp/util.hpp
@@ -18,6 +18,9 @@ using stringset = std::set<std::string>;
 std::string tolower(std::string input);
 std::string toupper(std::string input);
 
+// Return true if the string can be parsed as an integer.
+bool validinteger(const std::string &value);
+
 // String to integer.  Returns errval if the number is not parseable.
 int64_t strtoint(const std::string &value, int64_t errval);
 
diff --git a/luprex/core/cpp/world.cpp b/luprex/core/cpp/world.cpp
index 55b77394..ee610bff 100644
--- a/luprex/core/cpp/world.cpp
+++ b/luprex/core/cpp/world.cpp
@@ -50,7 +50,7 @@ void Tangible::be_a_player() {
         LuaVar classtab, mt, place, tangibles;
         LuaStack LS(world_->state(), classtab, mt, place, tangibles);
 
-        LS.call(classtab, source_makeclass, "player");
+        LS.makeclass(classtab, "player");
         LS.getfield(tangibles, LuaRegistry, "tangibles");
         LS.rawget(place, tangibles, anim_queue_.get_id());
         LS.getmetatable(mt, place);
diff --git a/luprex/core/lua/control.lst b/luprex/core/lua/control.lst
index ac08a981..a8cd0af9 100644
--- a/luprex/core/lua/control.lst
+++ b/luprex/core/lua/control.lst
@@ -6,4 +6,4 @@
 inspect.lua
 ut-table.lua
 ut-globaldb.lua
-
+player.lua
diff --git a/luprex/core/lua/player.lua b/luprex/core/lua/player.lua
new file mode 100644
index 00000000..ebbd4881
--- /dev/null
+++ b/luprex/core/lua/player.lua
@@ -0,0 +1,24 @@
+maketangible('player')
+
+function player.interface(actor, place, gui)
+    gui:menu_item("North")
+    gui:menu_item("South")
+    gui:menu_item("East")
+    gui:menu_item("West")
+end
+
+function player.action.north(actor, place, gui)
+    print("Moving north")
+end
+
+function player.action.south(actor, place, gui)
+    print("Moving south")
+end
+
+function player.action.east(actor, place, gui)
+    print("Moving east")
+end
+
+function player.action.west(actor, place, gui)
+    print("Moving west")
+end
diff --git a/luprex/luajit/src/lua.h b/luprex/luajit/src/lua.h
index 9e97f651..a3125c22 100644
--- a/luprex/luajit/src/lua.h
+++ b/luprex/luajit/src/lua.h
@@ -47,11 +47,6 @@
 #define LUA_ERRMEM	4
 #define LUA_ERRERR	5
 
-/* Additional thread status codes for luprex */
-#define LUA_ERRPARTIAL 15
-#define LUA_ERREOF 16
-
-
 typedef struct lua_State lua_State;
 
 typedef int (*lua_CFunction) (lua_State *L);