diff --git a/act2.cpp b/act2.cpp
index 721cc40..fda22b4 100644
--- a/act2.cpp
+++ b/act2.cpp
@@ -717,6 +717,8 @@ namespace obj_funcs
                 clock_disable(bint);
                 tell("The balloon is fastened to the hook.");
             }
+            else
+                rv = false;
         }
         else if (verbq("UNTIE") && prso == sfind_obj("BROPE"))
         {
@@ -735,8 +737,6 @@ namespace obj_funcs
         else
             rv = false;
         return rv;
-
-        return rv;
     }
 
     bool bcontents()
diff --git a/act3.cpp b/act3.cpp
index 61a69d3..0c19693 100644
--- a/act3.cpp
+++ b/act3.cpp
@@ -606,8 +606,8 @@ ScolWalls get_wall(const RoomP &rm)
 bool pass_the_bucket(const RoomP &r, const ObjectP &b)
 {
     const AdvP &winner = *::winner;
-    auto prso = ::prso();
     auto oldprsvec1 = prsvec[1];
+    prsvec[1] = std::monostate();
     remove_object(b);
     insert_object(b, r);
     if (winner->avehicle() == b)
diff --git a/act4.cpp b/act4.cpp
index 203d7af..1f1f257 100644
--- a/act4.cpp
+++ b/act4.cpp
@@ -33,8 +33,8 @@ Iterator<std::array<QuestionP, 3>> nqvec(nqvecb);
 
 namespace
 {
-    const std::string mrestr("   E");
-    const std::string mrwstr("MBRW");
+    const std::string_view mrestr("   E");
+    const std::string_view mrwstr("MBRW");
 }
 
 bool eg_infested(const RoomP &r)
@@ -105,11 +105,7 @@ bool follow()
 const RoomP &go_e_w(const RoomP &rm, direction dir)
 {
     const std::string &spr = rm->rid();
-    std::string str = mrestr;
-    if (dir != Ne && dir != Se)
-    {
-        str = mrwstr;
-    }
+    std::string str = std::string((dir != Ne && dir != Se) ? mrwstr : mrestr);
     return find_room(substruc(spr, 0, 3, str));
 }
 
@@ -240,11 +236,11 @@ bool enter_end_game()
     robber_demon->haction(nullptr);
 
     // Disable all active events in the adventurer's possession.
-    std::for_each(w->aobjs().begin(), w->aobjs().end(), [](const ObjectP &o)
+    for (const ObjectP& o : w->aobjs())
     {
         if (o->olint())
             clock_disable(o->olint()->ev());
-    });
+    }
 
     tro(lamp, touchbit);
     tro(sword, touchbit);
@@ -286,35 +282,21 @@ ObjList movies(const RoomP &rm)
     return list;
 }
 
-void stuff(const RoomP &r, ObjList l1, ObjList l2)
+void stuff(const RoomP &r, const ObjList &l1, const ObjList &l2)
 {
-    if (empty(l1))
-    {
-        l1 = l2;
-    }
-    else if (empty(l2))
-    {
-
-    }
-    else
-    {
-        l1.splice(l1.end(), l2);
-    }
-    for (const ObjectP &o : l1)
+    r->robjs() = l1;
+    r->robjs().insert(r->robjs().end(), l2.begin(), l2.end());
+    for (const ObjectP &o : r->robjs())
     {
         o->oroom(r);
     }
-    r->robjs() = l1;
 }
 
 void cell_move()
 {
     int new_ = pnumb;
     int old = lcell;
-    RoomP cell = sfind_room("CELL");
-    RoomP ncell = sfind_room("NCELL");
-    RoomP pcell = sfind_room("PCELL");
-    ObjectP d = sfind_obj("ODOOR");
+    const ObjectP &d = sfind_obj("ODOOR");
     ObjList po;
     const AdvP &me = player();
 
@@ -323,6 +305,9 @@ void cell_move()
 
     if (new_ != old)
     {
+        const RoomP& cell = sfind_room("CELL");
+        const RoomP& ncell = sfind_room("NCELL");
+        const RoomP& pcell = sfind_room("PCELL");
         cells[old-1] = po = movies(cell);
         stuff(cell, cells[new_ - 1], cobjs);
         cells[new_-1].clear();
@@ -684,16 +669,17 @@ bool look_to(std::string_view nstr,
 
 RoomP mirew()
 {
-    std::string new_rm = mdir == 0 ? mrwstr : mrestr;
+    std::string new_rm = std::string(mdir == 0 ? mrwstr : mrestr);
     new_rm.replace(0, 3, mloc->rid());
     return find_room(new_rm);
 }
 
-bool mirmove(bool northq, RoomP rm)
+bool mirmove(bool northq, const RoomP &rm)
 {
-    RoomP mrg = sfind_room("MRG");
+    using namespace std::string_view_literals;
+    const RoomP &mrg = sfind_room("MRG");
     bool pu = poleup != 0;
-    tell((pu ? "The structure wobbles " : "The structure slides ") + std::string(northq ? "north" : "south") +
+    tell((pu ? "The structure wobbles " : "The structure slides ") + (northq ? "north"sv : "south"sv) +
         " and stops over another compass rose.");
     mloc = rm;
     if (rm == mrg &&
@@ -722,25 +708,25 @@ bool mirmove(bool northq, RoomP rm)
 
 RoomP mirns(bool northq, bool exitq)
 {
-    RoomP mloc = ::mloc;
+    RoomP rv;
     const std::vector<Ex> &rex = mloc->rexits();
     const Ex *m;
     if (!exitq &&
         ((northq && mloc == northend) || (!northq && mloc == southend)))
     {
-        return RoomP();
+        // Do nothing
     }
     else if (m = memq(northq ? North : South, rex))
     {
         ExitType exit = std::get<1>(*m);
         if (auto cep = std::get_if<CExitPtr>(&exit))
-            return (*cep)->cxroom();
+            rv = (*cep)->cxroom();
         else if (auto roomp = std::get_if<RoomP>(&exit))
-            return *roomp;
+            rv = *roomp;
         else if (auto sp = std::get_if<std::string>(&exit))
-            return sfind_room(*sp);
+            rv = sfind_room(*sp);
     }
-    return nullptr;
+    return rv;
 }
 
 bool mirblock(direction dir, int mdir)
diff --git a/act4.h b/act4.h
index 1c10a33..31c101c 100644
--- a/act4.h
+++ b/act4.h
@@ -30,7 +30,7 @@ bool look_to(std::string_view nstr,
     bool htell = true);
 bool mirblock(direction dir, int mdir);
 RoomP mirew();
-bool mirmove(bool northq, RoomP rm);
+bool mirmove(bool northq, const RoomP &rm);
 RoomP mirns(bool northq = (mdir < 180), bool exitq = false);
 std::optional<int> mirror_here(RoomP rm);
 bool start_end();
diff --git a/defs.h b/defs.h
index 8541dd9..fd4c6a1 100644
--- a/defs.h
+++ b/defs.h
@@ -9,14 +9,14 @@
 #include <list>
 #include <any>
 #include <optional>
+#include <sstream>
 #include <string_view>
 
 inline std::string operator+(std::string_view s1, std::string_view s2)
 {
-    std::string rv;
-    rv.reserve(s1.size() + s2.size());
-    std::copy(s2.begin(), s2.end(), std::copy(s1.begin(), s1.end(), std::back_inserter(rv)));
-    return rv;
+    std::stringstream ss;
+    ss << s1 << s2;
+    return ss.str();
 }
 
 enum e_oactor
diff --git a/dung.cpp b/dung.cpp
index 6886552..184e73e 100644
--- a/dung.cpp
+++ b/dung.cpp
@@ -21,9 +21,9 @@ namespace
     void init_actors()
     {
         // Dungeon master
-        add_actor(oa_master, get_room("BDOOR"), {}, 0, nullptr, get_obj("MASTE"), actor_funcs::master_actor, 30);
-        add_actor(oa_player, get_room("WHOUS"), {}, 0, nullptr, get_obj("#####"), actor_funcs::dead_function, 0);
-        add_actor(oa_robot, get_room("MAGNE"), {}, 0, nullptr, get_obj("ROBOT"), actor_funcs::robot_actor, 3);
+        add_actor(oa_master, sfind_room("BDOOR"), {}, 0, nullptr, sfind_obj("MASTE"), actor_funcs::master_actor, 30);
+        add_actor(oa_player, sfind_room("WHOUS"), {}, 0, nullptr, sfind_obj("#####"), actor_funcs::dead_function, 0);
+        add_actor(oa_robot, sfind_room("MAGNE"), {}, 0, nullptr, sfind_obj("ROBOT"), actor_funcs::robot_actor, 3);
     }
 
     std::vector<VerbP> init_actions(const StringList &il)
@@ -51,29 +51,35 @@ namespace
 // Bunch vector.
 ObjVector bunch_cont()
 {
-    ObjVector ov(8, get_obj("#####"));
+    ObjVector ov(8, sfind_obj("#####"));
     return ov;
 }
-ObjVector bunuvec_cont = bunch_cont();
-Iterator<ObjVector> bunuvec(bunuvec_cont, bunuvec_cont.end());
-Iterator<ObjVector> bunch(bunuvec);
+ObjVector bunuvec_cont;
+Iterator<ObjVector> bunuvec;
+Iterator<ObjVector> bunch;
+
+void init_bunch()
+{
+    bunuvec_cont = bunch_cont();
+    bunuvec = Iterator<ObjVector>(bunuvec_cont, bunuvec_cont.end());
+    bunch = bunuvec;
+}
 
 WordsPobl words_pobl;
 
 // Globals from dung.mud appear here.
-PhraseVecV make_prepvec()
+PhraseVecV prepvecb;
+PrepVec prepvec;
+
+void init_prepvec()
 {
     auto with_prep = find_prep("WITH");
-    auto cretin = get_obj("#####");
-    PhraseVecV pvv;
-    std::generate_n(std::back_inserter(pvv), 5, [&with_prep, &cretin]() { return make_phrase(with_prep, cretin); });
-    return pvv;
+    auto cretin = sfind_obj("#####");
+    prepvecb.clear();
+    std::generate_n(std::back_inserter(prepvecb), 5, [&with_prep, &cretin]() { return make_phrase(with_prep, cretin); });
+    prepvec = prepvecb;
 }
 
-PhraseVecV prepvecb = make_prepvec();
-
-PrepVec prepvec(prepvecb);
-
 // Attacking things...
 const std::vector<attack_state> def1 = { missed, missed, missed, missed,
     stagger, stagger,
@@ -966,6 +972,10 @@ void init_dung()
     dir_syns();
 
 	init_objects();
+    // Some objects that were initialized globally, but need to be done after init_objects().
+    last_it = sfind_obj("#####");
+    init_bunch();
+    init_prepvec();
     init_synonyms();
     init_rooms();
     init_actors();
diff --git a/gobject.h b/gobject.h
index 794f665..75b6e1b 100644
--- a/gobject.h
+++ b/gobject.h
@@ -1,4 +1,4 @@
-// Generated at 12-28-19 16:06:15
+// Generated at 01-14-21 13:45:01
 #pragma once
 const GObjectDefinition gobjects[] = {
 {numbits, { "IT", "THAT", "THIS", "HIM" }, {  }, "random object", { ovison, ndescbit } },
diff --git a/info.cpp b/info.cpp
index d06ba87..199b7c8 100644
--- a/info.cpp
+++ b/info.cpp
@@ -82,7 +82,7 @@ const std::string_view help_str =
 "Command parser:\n\n"
 "   A command is one line of text terminated by a carriage return.\n"
 "For reasons of simplicity, all words are distinguished by their\n"
-"first six letters.  All others are ignored.  For example, typing\n"
+"first five letters.  All others are ignored.  For example, typing\n"
 "'DISASSEMBLE THE ENCYCLOPEDIA' is not only meaningless, it also\n"
 "creates excess effort for your fingers.  Note that this trunca-\n"
 "tion may produce ambiguities in the interpretation of longer words.\n\n"
diff --git a/melee.cpp b/melee.cpp
index 66de36f..4d90ec0 100644
--- a/melee.cpp
+++ b/melee.cpp
@@ -20,11 +20,10 @@ namespace
 int fight_strength(const AdvP &hero, bool adjust)
 {
     int s, smax = strength_max, smin = strength_min;
-    float f = float(hero->ascore()) / float(score_max());
-    f *= (smax - smin);
-    f += 0.5f;
-    s = (int)f + smin;
-
+    int pct = hero->ascore() * 100 / score_max();
+    pct *= (smax - smin);
+    pct += 50;
+    s = (pct / 100) + smin;
     return adjust ? (s + hero->astrength()) : s;
 }
 
diff --git a/objdefs.h b/objdefs.h
index 92701b6..05de9aa 100644
--- a/objdefs.h
+++ b/objdefs.h
@@ -1,4 +1,4 @@
-// Generated at 12-28-19 16:06:15
+// Generated at 01-14-21 13:45:01
 #pragma once
 const ObjectDefinition objects[] = {
 {{ "BUTTO" }, {  }, "", { }},
diff --git a/object.cpp b/object.cpp
index b6a85b0..34cadbb 100644
--- a/object.cpp
+++ b/object.cpp
@@ -112,7 +112,7 @@ namespace
 }
 
 // last_it must be defined after Objects.
-ObjectP last_it(get_obj("#####"));
+ObjectP last_it;
 
 Object::Object(const std::initializer_list<const char *> &syns, const std::initializer_list<const char *> &adj, const char *description,
     const std::initializer_list<Bits> &bits, rapplic objfun, const StringList &cntnts, 
@@ -492,6 +492,7 @@ const ObjectP &find_obj(std::string_view name)
 {
     _ASSERT(name.size() <= 5); // To catch typos
     auto iter = Objects().find(name);
+    _ASSERT(iter != Objects().end());
     return iter->second.front();
 }
 
diff --git a/room.cpp b/room.cpp
index cac46da..f67dc96 100644
--- a/room.cpp
+++ b/room.cpp
@@ -15,8 +15,8 @@
 #define notree_FORE5 notree_FORE1
 #define kitchen_window_EHOUS std::make_shared<DoorExit>("WINDO", "KITCH", "EHOUS")
 #define kitchen_window_KITCH kitchen_window_EHOUS
-#define magcmach_MAGNE std::make_shared<CExit>(frobozz, "cmach", "", false, exit_funcs::magnet_room_exit)
-#define magalice_MAGNE std::make_shared<CExit>(frobozz, "cmach", "", false, exit_funcs::magnet_room_exit)
+#define magcmach_MAGNE std::make_shared<CExit>(frobozz, "CMACH", "", false, exit_funcs::magnet_room_exit)
+#define magalice_MAGNE std::make_shared<CExit>(frobozz, "CMACH", "", false, exit_funcs::magnet_room_exit)
 #define current_RIVR1 NExit("You cannot go upstream due to strong currents.")
 #define current_RIVR2 current_RIVR1
 #define current_RIVR3 current_RIVR1
@@ -227,6 +227,8 @@ void init_rooms()
 
 const RoomP &find_room(std::string_view rid)
 {
-    return room_map().find(rid)->second;
+    auto iter = room_map().find(rid);
+    _ASSERT(iter != room_map().end());
+    return iter->second;
 }
 
diff --git a/rooms.cpp b/rooms.cpp
index b65ec53..f6786bf 100644
--- a/rooms.cpp
+++ b/rooms.cpp
@@ -51,12 +51,9 @@ void excruciatingly_untasteful_code()
     // ???
 }
 
-std::string remarkably_disgusting_code()
+const char *remarkably_disgusting_code()
 {
-    std::string s = "This Zork created ";
-    s += __DATE__;
-    s += ".";
-    return s;
+    return "This Zork created " __DATE__ ".";
 }
 
 std::string unspeakable_code()
@@ -65,10 +62,11 @@ std::string unspeakable_code()
     const std::string &oread = O->oread();
     auto pos = oread.find_first_of('/');
     pos -= (oread[pos - 2] == '1' ? 2 : 1);
-    std::string s = "There is an issue of US NEWS & DUNGEON REPORT dated ";
-    s += oread.substr(pos, oread.find_first_of(' ', pos) - pos);
-    s += " here.";
-    return s;
+    std::stringstream ss;
+    ss << "There is an issue of US NEWS & DUNGEON REPORT dated ";
+    ss << std::string_view(&oread[pos], oread.find_first_of(' ', pos) - pos);
+    ss << " here.";
+    return ss.str();
 }
 
 void contin(bool foo)
@@ -82,7 +80,6 @@ int score(bool ask)
 {
     bool eg = flags[end_game_flag];
     int scor, smax;
-    float pct;
     flags[tell_flag] = true;
     princ("Your score ");
     if (eg)
@@ -106,27 +103,27 @@ int score(bool ask)
         princ(" moves.");
     crlf();
     princ("This score gives you the rank of ");
-    pct = (float)scor / (float)smax;
+    int pct = (scor * 100) / smax;
     if (eg)
     {
-        princ((pct == 1.0) ? "Dungeon Master" :
-            (pct > 0.75) ? "Super Cheater" :
-            (pct > 0.50) ? "Master Cheater" :
-            (pct > 0.25) ? "Advanced Cheater" :
+        princ((pct == 100) ? "Dungeon Master" :
+            (pct > 75) ? "Super Cheater" :
+            (pct > 50) ? "Master Cheater" :
+            (pct > 25) ? "Advanced Cheater" :
             "Cheater");
     }
     else
     {
-        princ((pct == 1.0) ? "Cheater" :
-            (pct > 0.95) ? "Wizard" :
-            (pct > 0.8999999) ? "Master" :
-            (pct > 0.7999999) ? "Winner" :
-            (pct > 0.6000000) ? "Hacker" :
-            (pct > 0.3999999) ? "Adventurer" :
-            (pct > 0.1999999) ? "Junior Adventurer" :
-            (pct > 0.0999999) ? "Novice Adventurer" :
-            (pct > 0.0499999) ? "Amateur Adventurer" :
-            (pct >= 0.0) ? "Beginner" :
+        princ((pct == 100) ? "Cheater" :
+            (pct > 95) ? "Wizard" :
+            (pct > 89) ? "Master" :
+            (pct > 79) ? "Winner" :
+            (pct > 60) ? "Hacker" :
+            (pct > 39) ? "Adventurer" :
+            (pct > 19) ? "Junior Adventurer" :
+            (pct > 9) ? "Novice Adventurer" :
+            (pct > 4) ? "Amateur Adventurer" :
+            (pct >= 0) ? "Beginner" :
             "Incompetent");
     }
     princ(".");
@@ -201,7 +198,7 @@ void score_room(const RoomP &rm)
     }
 }
 
-void start(const std::string &rm, const std::string &st)
+void start(std::string_view rm, std::string_view st)
 {
     here = find_room(rm);
     (*winner)->aroom(here);
@@ -213,7 +210,6 @@ void start(const std::string &rm, const std::string &st)
 
 void save_it(bool strt)
 {
-    std::string st = remarkably_disgusting_code();
     sfind_obj("PAPER")->odesc1(unspeakable_code());
     dead_player = player()->aaction();
     player()->aaction(nullptr);
@@ -222,7 +218,7 @@ void save_it(bool strt)
     moves = 0;
     winner = &player();
     srand((unsigned int)time(NULL));
-    start("WHOUS", st);
+    start("WHOUS", remarkably_disgusting_code());
 }
 
 bool object_action()
@@ -381,7 +377,7 @@ bool room_info(std::optional<int> full)
     }
     else if (!full && !flags[no_obj_print] || full && !((full.value() & 1) == 0))
     {
-        for (ObjectP x : rm->robjs())
+        for (auto &x : rm->robjs())
         {
             if (trnn(x, ovison) &&
                 ( (full && (full.value() == 1)) || describable(x)))
diff --git a/rooms.h b/rooms.h
index 40230ea..41db716 100644
--- a/rooms.h
+++ b/rooms.h
@@ -59,8 +59,8 @@ typedef std::array<ParseContP, lexsize> ParseContV;
 extern Iterator<ParseContV> parse_cont;
 
 std::string unspeakable_code();
-std::string remarkably_disgusting_code();
-void start(const std::string &rm, const std::string &st = std::string());
+const char *remarkably_disgusting_code();
+void start(std::string_view &rm, std::string_view st = std::string());
 void save_it(bool start = true);
 void contin(bool foo = false);
 bool goto_(const RoomP &rm, const AdvP &win = *winner);