diff --git a/src/scenario/outdoors.cpp b/src/scenario/outdoors.cpp
index 999f55b5..030b1424 100644
--- a/src/scenario/outdoors.cpp
+++ b/src/scenario/outdoors.cpp
@@ -195,7 +195,7 @@ void cOutdoors::cWandering::readFrom(const cTagFile_Page& page){
 	std::copy_n(temp.begin(), friendly.size(), friendly.begin());
 }
 
-bool cOutdoors::cWandering::isNull(){
+bool cOutdoors::cWandering::isNull() const {
 	for(short i = 0; i < 7; i++)
 		if(monst[i] != 0)
 			return false;
diff --git a/src/scenario/outdoors.hpp b/src/scenario/outdoors.hpp
index 897aefe6..0f1314d5 100644
--- a/src/scenario/outdoors.hpp
+++ b/src/scenario/outdoors.hpp
@@ -45,7 +45,7 @@ public:
 		short end_spec1,end_spec2;
 		bool cant_flee, forced;
 		
-		bool isNull();
+		bool isNull() const;
 		void import_legacy(legacy::out_wandering_type old);
 		void writeTo(cTagFile_Page& page) const;
 		void readFrom(const cTagFile_Page& page);
diff --git a/src/scenario/scenario.cpp b/src/scenario/scenario.cpp
index 6849d723..ef2f938b 100644
--- a/src/scenario/scenario.cpp
+++ b/src/scenario/scenario.cpp
@@ -304,19 +304,19 @@ static std::string format_version(const unsigned char(& ver)[3]) {
 	return fmt.str();
 }
 
-std::string cScenario::format_ed_version() {
+std::string cScenario::format_ed_version() const {
 	return format_version(format.prog_make_ver);
 }
 
-std::string cScenario::format_scen_version() {
+std::string cScenario::format_scen_version() const {
 	return format_version(format.ver);
 }
 
-ter_num_t cScenario::get_ground_from_ter(ter_num_t ter){
+ter_num_t cScenario::get_ground_from_ter(ter_num_t ter) const {
 	return get_ter_from_ground(ter_types[ter].ground_type);
 }
 
-ter_num_t cScenario::get_ter_from_ground(unsigned short ground){
+ter_num_t cScenario::get_ter_from_ground(unsigned short ground) const {
 	ter_num_t archetype = -1;
 	for(int i = 0; i < ter_types.size(); i++)
 		if(ter_types[i].ground_type == ground) {
@@ -328,7 +328,7 @@ ter_num_t cScenario::get_ter_from_ground(unsigned short ground){
 	return std::max(archetype, ter_num_t());
 }
 
-ter_num_t cScenario::get_trim_terrain(unsigned short ground, unsigned short trim_g, eTrimType trim) {
+ter_num_t cScenario::get_trim_terrain(unsigned short ground, unsigned short trim_g, eTrimType trim) const {
 	for(int i = 0; i < ter_types.size(); i++) {
 		if(ter_types[i].ground_type != ground)
 			continue;
@@ -341,7 +341,7 @@ ter_num_t cScenario::get_trim_terrain(unsigned short ground, unsigned short trim
 	return 90;
 }
 
-bool cScenario::is_ter_used(ter_num_t ter) {
+bool cScenario::is_ter_used(ter_num_t ter) const {
 	if(ter >= ter_types.size()) return false;
 	if(ter <= 90) return true;
 	for(int sx = 0; sx < outdoors.width(); sx++) {
@@ -365,7 +365,7 @@ bool cScenario::is_ter_used(ter_num_t ter) {
 	return false;
 }
 
-bool cScenario::is_monst_used(mon_num_t monst) {
+bool cScenario::is_monst_used(mon_num_t monst) const {
 	if(monst >= scen_monsters.size()) return false;
 	for(int sx = 0; sx < outdoors.width(); sx++) {
 		for(int sy = 0; sy < outdoors.height(); sy++) {
@@ -400,7 +400,7 @@ bool cScenario::is_monst_used(mon_num_t monst) {
 	return false;
 }
 
-bool cScenario::is_item_used(item_num_t item) {
+bool cScenario::is_item_used(item_num_t item) const {
 	if(item >= scen_items.size()) return false;
 	for(int i = 0; i < towns.size(); i++) {
 		for(int j = 0; j < towns[i]->preset_items.size(); j++) {
@@ -411,7 +411,7 @@ bool cScenario::is_item_used(item_num_t item) {
 	return false;
 }
 
-cItem cScenario::get_stored_item(int loot) {
+cItem cScenario::get_stored_item(int loot) const {
 	if(loot >= 0 && loot < scen_items.size())
 		return scen_items[loot];
 	return cItem();
@@ -420,7 +420,7 @@ cItem cScenario::get_stored_item(int loot) {
 static const short loot_min[5] = {0,0,5,50,400};
 static const short loot_max[5] = {3,8,40,800,4000};
 
-cItem cScenario::pull_item_of_type(unsigned int loot_max,short min_val,short max_val, const std::vector<eItemType>& types,bool allow_junk_treasure) {
+cItem cScenario::pull_item_of_type(unsigned int loot_max,short min_val,short max_val, const std::vector<eItemType>& types,bool allow_junk_treasure) const {
 	// occasionally get nice item
 	if(get_ran(1,0,160) == 80) {
 		loot_max += 2;
@@ -444,7 +444,7 @@ enum eTreasureType {
 	SCROLL, WAND, RING, NECKLACE, POISON, GLOVES, BOOTS,
 };
 
-cItem cScenario::return_treasure(int loot, bool allow_junk) {
+cItem cScenario::return_treasure(int loot, bool allow_junk) const {
 	static const std::vector<eItemType>
 		weapon = {eItemType::ONE_HANDED,eItemType::TWO_HANDED},
 		armor = {eItemType::ARMOR}, shield = {eItemType::SHIELD}, helm = {eItemType::HELM},
diff --git a/src/scenario/scenario.hpp b/src/scenario/scenario.hpp
index 329c7407..8f161944 100644
--- a/src/scenario/scenario.hpp
+++ b/src/scenario/scenario.hpp
@@ -100,21 +100,21 @@ public:
 	void import_legacy(legacy::scen_item_data_type& old);
 	void writeTo(cTagFile& file) const;
 	void readFrom(const cTagFile& file);
-	std::string format_scen_version();
-	std::string format_ed_version();
+	std::string format_scen_version() const;
+	std::string format_ed_version() const;
 	
-	ter_num_t get_ground_from_ter(ter_num_t ter);
-	ter_num_t get_ter_from_ground(unsigned short ground);
-	ter_num_t get_trim_terrain(unsigned short ground, unsigned short trim_g, eTrimType trim);
+	ter_num_t get_ground_from_ter(ter_num_t ter) const;
+	ter_num_t get_ter_from_ground(unsigned short ground) const;
+	ter_num_t get_trim_terrain(unsigned short ground, unsigned short trim_g, eTrimType trim) const;
 	cOutdoors& get_sector(int x, int y);
 	bool is_town_entrance_valid(spec_loc_t loc) const;
 	
-	bool is_ter_used(ter_num_t ter);
-	bool is_monst_used(mon_num_t monst);
-	bool is_item_used(item_num_t item);
-	cItem get_stored_item(int loot);
-	cItem return_treasure(int loot, bool allow_junk_treasure = false);
-	cItem pull_item_of_type(unsigned int loot_max,short min_val,short max_val,const std::vector<eItemType>& types,bool allow_junk_treasure=false);
+	bool is_ter_used(ter_num_t ter) const;
+	bool is_monst_used(mon_num_t monst) const;
+	bool is_item_used(item_num_t item) const;
+	cItem get_stored_item(int loot) const;
+	cItem return_treasure(int loot, bool allow_junk_treasure = false) const;
+	cItem pull_item_of_type(unsigned int loot_max,short min_val,short max_val,const std::vector<eItemType>& types,bool allow_junk_treasure=false) const;
 	
 	void reset_version();
 	explicit cScenario();
diff --git a/src/scenario/shop.cpp b/src/scenario/shop.cpp
index 08e8f049..3e99fbb6 100644
--- a/src/scenario/shop.cpp
+++ b/src/scenario/shop.cpp
@@ -85,7 +85,7 @@ cShop::cShop(eShopPreset preset) {
 	}
 }
 
-size_t cShop::firstEmpty() {
+size_t cShop::firstEmpty() const {
 	for(size_t i = 0; i < items.size(); i++) {
 		if(items[i].type == eShopItemType::EMPTY)
 			return i;
@@ -320,7 +320,7 @@ void cShop::clear() {
 	items.clear();
 }
 
-int cShopItem::getCost(int adj) {
+int cShopItem::getCost(int adj) const {
 	int cost = item.value;
 	if(item.charges > 0)
 		cost *= item.charges;
diff --git a/src/scenario/shop.hpp b/src/scenario/shop.hpp
index 8e11c910..3ef26f3e 100644
--- a/src/scenario/shop.hpp
+++ b/src/scenario/shop.hpp
@@ -53,7 +53,7 @@ struct cShopItem {
 	eShopItemType type = eShopItemType::EMPTY;
 	size_t quantity, index;
 	cItem item{ITEM_SHOP};
-	int getCost(int adj);
+	int getCost(int adj) const;
 };
 
 enum eShopPreset {SHOP_HEALING, SHOP_JUNK};
@@ -65,7 +65,7 @@ class cShop {
 	eShopType type;
 	eShopPrompt prompt;
 	pic_num_t face;
-	size_t firstEmpty();
+	size_t firstEmpty() const;
 public:
 	static const size_t INFINITE = 0;
 	cShop();
diff --git a/src/scenario/town.cpp b/src/scenario/town.cpp
index 9aee0402..a400db92 100644
--- a/src/scenario/town.cpp
+++ b/src/scenario/town.cpp
@@ -166,14 +166,14 @@ void cTown::cField::import_legacy(legacy::preset_field_type old){
 	}
 }
 
-bool cTown::cWandering::isNull(){
+bool cTown::cWandering::isNull() const {
 	for(short i = 0;i < 4;i++)
 		if(monst[i] != 0)
 			return false;
 	return true;
 }
 
-bool cTown::is_cleaned_out() {
+bool cTown::is_cleaned_out() const {
 	if(max_num_monst < 0) return false;
 	return m_killed >= max_num_monst;
 }
@@ -209,7 +209,7 @@ void cTown::set_up_lights() {
 	}
 }
 
-short cTown::light_obscurity(short x,short y) {
+short cTown::light_obscurity(short x,short y) const {
 	if(!is_on_map(loc(x,y))) return 5;
 	ter_num_t what_terrain = this->terrain(x,y);
 	eTerObstruct store = scenario->ter_types[what_terrain].blockage;
diff --git a/src/scenario/town.hpp b/src/scenario/town.hpp
index f8e6acf0..faf75484 100644
--- a/src/scenario/town.hpp
+++ b/src/scenario/town.hpp
@@ -49,7 +49,7 @@ public:
 	public:
 		std::array<mon_num_t,4> monst;
 		
-		bool isNull();
+		bool isNull() const;
 		void import_legacy(legacy::wandering_type old);
 	};
 	class cItem { // formerly preset_item_type
@@ -107,8 +107,8 @@ public:
 	void import_legacy(T& old, int town_num);
 	void init_start();
 	void set_up_lights();
-	short light_obscurity(short x,short y); // Obscurity function used for calculating lighting
-	bool is_cleaned_out();
+	short light_obscurity(short x,short y) const; // Obscurity function used for calculating lighting
+	bool is_cleaned_out() const;
 	
 	explicit cTown(cScenario& scenario, size_t dim);
 	void import_legacy(legacy::town_record_type& old);