diff --git a/MODDING.md b/MODDING.md
index e421f87..7128380 100644
--- a/MODDING.md
+++ b/MODDING.md
@@ -56,7 +56,7 @@ The file path of the area's texture (background).
 Gravity the area has; applies to items' velocities per tick.
 #### Friction (float)
 Friction of the area; applies to items' velocities when grounded or hitting walls.
-### AirResistance (float)
+#### AirResistance (float)
 Air resistance of the area; applies to items' velocities when airborne.
 
 ## character.xml
@@ -416,6 +416,10 @@ The additional eat speed multiplier the item will give if eaten.
 The item's gravity; will use the default gravity if not available.
 #### ChewCount (int; optional)
 An item's custom chew count.
+#### UpgradeID (string; optional)
+The name of another item that this item will be able to be upgraded to.
+#### UpgradeCount (int; optional)
+The amount of this item it will take to upgrade to the upgrade item specified in UpgradeID.
 #### IsPlayReward (bool; optional)
 The item will be given out when the reward is hit in play (see play.xml)
 #### IsToggleSpritesheet (bool; optional)
@@ -451,6 +455,10 @@ The sound that will play, based on SoundRootPath.
 Will play when clicking on a widget in a menu.
 #### Sound (path)
 The sound that will play, based on SoundRootPath.
+### CheatsActivated
+Sound that will play after entering a special code to activate cheats.
+#### Sound (path)
+The sound that will play, based on SoundRootPath.
 
 ## play.xml
 Determines behavior and appearance of the "Play" minigame.
diff --git a/src/resource/xml/item.cpp b/src/resource/xml/item.cpp
index 509d5de..51f393e 100644
--- a/src/resource/xml/item.cpp
+++ b/src/resource/xml/item.cpp
@@ -87,6 +87,22 @@ namespace game::resource::xml
         query_sound_entry_collection(element, "Dispose", archive, soundRootPath, sounds.dispose);
         query_sound_entry_collection(element, "Return", archive, soundRootPath, sounds.return_);
         query_sound_entry_collection(element, "Summon", archive, soundRootPath, sounds.summon);
+        query_sound_entry_collection(element, "Upgrade", archive, soundRootPath, sounds.upgrade);
+        query_sound_entry_collection(element, "UpgradeFail", archive, soundRootPath, sounds.upgradeFail);
+      }
+
+      if (auto element = root->FirstChildElement("Items"))
+      {
+        int id{};
+
+        for (auto child = element->FirstChildElement("Item"); child; child = child->NextSiblingElement("Item"))
+        {
+          std::string name{};
+          query_string_attribute(child, "Name", &name);
+          stringToIDMap[name] = id;
+          idToStringMap[id] = name;
+          id++;
+        }
       }
 
       if (auto element = root->FirstChildElement("Items"))
@@ -108,7 +124,24 @@ namespace game::resource::xml
           query_float_optional_attribute(child, "DigestionBonus", item.digestionBonus);
           query_float_optional_attribute(child, "EatSpeedBonus", item.eatSpeedBonus);
           query_float_optional_attribute(child, "Gravity", item.gravity);
+
           query_int_optional_attribute(child, "ChewCount", item.chewCount);
+
+          if (child->FindAttribute("UpgradeID"))
+          {
+            std::string upgradeIDString{};
+            query_string_attribute(child, "UpgradeID", &upgradeIDString);
+
+            if (!upgradeIDString.empty() && stringToIDMap.contains(upgradeIDString))
+              item.upgradeID = stringToIDMap[upgradeIDString];
+            else if (upgradeIDString.empty())
+              logger.warning(std::format("Empty UpgradeID ({})", item.name));
+            else
+              logger.warning(std::format("Could not find item ID for UpgradeID: {} ({})", upgradeIDString, item.name));
+
+            query_int_optional_attribute(child, "UpgradeCount", item.upgradeCount);
+          }
+
           query_bool_attribute(child, "IsPlayReward", &item.isPlayReward);
           query_bool_attribute(child, "IsToggleSpritesheet", &item.isToggleSpritesheet);
 
diff --git a/src/resource/xml/item.hpp b/src/resource/xml/item.hpp
index 1f8d752..a9168da 100644
--- a/src/resource/xml/item.hpp
+++ b/src/resource/xml/item.hpp
@@ -42,6 +42,8 @@ namespace game::resource::xml
       std::string description{UNDEFINED};
       int categoryID{};
       int rarityID{};
+      std::optional<int> upgradeCount{};
+      std::optional<int> upgradeID{};
       std::optional<int> flavorID;
       std::optional<float> calories{};
       std::optional<float> eatSpeedBonus{};
@@ -63,11 +65,15 @@ namespace game::resource::xml
       SoundEntryCollection return_{};
       SoundEntryCollection dispose{};
       SoundEntryCollection summon{};
+      SoundEntryCollection upgrade{};
+      SoundEntryCollection upgradeFail{};
     };
 
     std::unordered_map<std::string, int> categoryMap{};
     std::unordered_map<std::string, int> rarityMap{};
     std::unordered_map<std::string, int> flavorMap{};
+    std::unordered_map<std::string, int> stringToIDMap{};
+    std::unordered_map<int, std::string> idToStringMap{};
 
     using Pool = std::vector<int>;
 
diff --git a/src/resource/xml/menu.cpp b/src/resource/xml/menu.cpp
index 6ecd5c2..daae997 100644
--- a/src/resource/xml/menu.cpp
+++ b/src/resource/xml/menu.cpp
@@ -36,6 +36,7 @@ namespace game::resource::xml
         query_sound_entry_collection(element, "Close", archive, soundRootPath, sounds.close);
         query_sound_entry_collection(element, "Hover", archive, soundRootPath, sounds.hover);
         query_sound_entry_collection(element, "Select", archive, soundRootPath, sounds.select);
+        query_sound_entry_collection(element, "CheatsActivated", archive, soundRootPath, sounds.cheatsActivated);
       }
     }
 
diff --git a/src/resource/xml/menu.hpp b/src/resource/xml/menu.hpp
index 6f4712d..8194ccb 100644
--- a/src/resource/xml/menu.hpp
+++ b/src/resource/xml/menu.hpp
@@ -15,6 +15,7 @@ namespace game::resource::xml
       SoundEntryCollection close{};
       SoundEntryCollection hover{};
       SoundEntryCollection select{};
+      SoundEntryCollection cheatsActivated{};
     };
 
     Sounds sounds{};
diff --git a/src/state/main.cpp b/src/state/main.cpp
index 0615cd0..a56b6bb 100644
--- a/src/state/main.cpp
+++ b/src/state/main.cpp
@@ -1,5 +1,6 @@
 #include "main.hpp"
 
+#include <array>
 #include <glm/glm.hpp>
 #include <imgui.h>
 #include <imgui_impl_opengl3.h>
@@ -34,6 +35,8 @@ namespace game::state
     auto& dialogue = data.dialogue;
     auto& menuSchema = data.menuSchema;
     this->characterIndex = selectedCharacterIndex;
+    konamiCodeIndex = 0;
+    konamiCodeStartTime = 0.0;
 
     character =
         entity::Character(data, vec2(World::BOUNDS.x + World::BOUNDS.z * 0.5f, World::BOUNDS.w - World::BOUNDS.y));
@@ -132,9 +135,55 @@ namespace game::state
 
   void Main::update(Resources& resources)
   {
+    static constexpr std::array<ImGuiKey, 10> KONAMI_CODE = {
+        ImGuiKey_UpArrow,    ImGuiKey_UpArrow,   ImGuiKey_DownArrow,  ImGuiKey_DownArrow, ImGuiKey_LeftArrow,
+        ImGuiKey_RightArrow, ImGuiKey_LeftArrow, ImGuiKey_RightArrow, ImGuiKey_B,         ImGuiKey_A};
+    static constexpr std::array<ImGuiKey, 6> KONAMI_INPUT_KEYS = {
+        ImGuiKey_UpArrow, ImGuiKey_DownArrow, ImGuiKey_LeftArrow, ImGuiKey_RightArrow, ImGuiKey_B, ImGuiKey_A};
+    static constexpr auto KONAMI_CODE_INPUT_TIME_SECONDS = 5.0;
+
     auto focus = focus_get();
     auto& dialogue = character.data.dialogue;
 
+    if (!menu.isCheats)
+    {
+      for (auto key : KONAMI_INPUT_KEYS)
+      {
+        if (!ImGui::IsKeyPressed(key, false)) continue;
+
+        if (key == KONAMI_CODE[konamiCodeIndex])
+        {
+          konamiCodeIndex++;
+          konamiCodeStartTime = ImGui::GetTime();
+        }
+        else if (key == KONAMI_CODE[0])
+        {
+          konamiCodeIndex = 1;
+          konamiCodeStartTime = ImGui::GetTime();
+        }
+        else
+        {
+          konamiCodeIndex = 0;
+          konamiCodeStartTime = 0.0;
+        }
+
+        if (konamiCodeIndex >= (int)KONAMI_CODE.size())
+        {
+          menu.isCheats = true;
+          konamiCodeIndex = 0;
+          konamiCodeStartTime = 0.0;
+          toasts.push("Cheats unlocked!");
+          character.data.menuSchema.sounds.cheatsActivated.play();
+        }
+      }
+
+      if (konamiCodeIndex > 0 && (ImGui::GetTime() - konamiCodeStartTime > KONAMI_CODE_INPUT_TIME_SECONDS))
+      {
+        konamiCodeIndex = 0;
+        konamiCodeStartTime = 0.0;
+      }
+    }
+
     if (isWindows)
     {
       menu.update(resources, itemManager, character, cursor, text, worldCanvas);
diff --git a/src/state/main.hpp b/src/state/main.hpp
index 3de806c..cadf6ef 100644
--- a/src/state/main.hpp
+++ b/src/state/main.hpp
@@ -42,6 +42,8 @@ namespace game::state
     int areaIndex{};
 
     float autosaveTime{};
+    int konamiCodeIndex{};
+    double konamiCodeStartTime{};
 
     bool isWindows{true};
 
diff --git a/src/state/main/inventory.cpp b/src/state/main/inventory.cpp
index 01f6ed9..35189b3 100644
--- a/src/state/main/inventory.cpp
+++ b/src/state/main/inventory.cpp
@@ -76,6 +76,9 @@ namespace game::state::main
         auto canvasSize = ivec2(std::max(1.0f, previewSize.x), std::max(1.0f, previewSize.y));
         if (!canvases.contains(i)) canvases.emplace((int)i, Canvas(canvasSize, Canvas::FLIP));
         auto& canvas = canvases[i];
+        bool isPossibleToUpgrade = item.upgradeID.has_value() && item.upgradeCount.has_value() &&
+                                   schema.idToStringMap.contains(*item.upgradeID);
+        bool isAbleToUpgrade = isPossibleToUpgrade && quantity >= *item.upgradeCount;
         canvas.zoom = math::to_percent(previewScale);
         canvas.pan = vec2(rect.x, rect.y);
         canvas.bind();
@@ -90,7 +93,30 @@ namespace game::state::main
                                          quantity <= 0 ? ImVec4(0, 0, 0, 1) : ImVec4(1, 1, 1, 1))) &&
             quantity > 0)
         {
-          if (category.isEdible)
+          if (ImGui::IsKeyDown(ImGuiMod_Shift))
+          {
+            if (isAbleToUpgrade)
+            {
+              if (ImGui::IsKeyDown(ImGuiMod_Ctrl))
+              {
+                while (quantity >= *item.upgradeCount)
+                {
+                  values.at(*item.upgradeID)++;
+                  quantity -= *item.upgradeCount;
+                }
+              }
+              else
+              {
+                values.at(*item.upgradeID)++;
+                quantity -= *item.upgradeCount;
+              }
+
+              schema.sounds.upgrade.play();
+            }
+            else
+              schema.sounds.upgradeFail.play();
+          }
+          else if (category.isEdible)
           {
             if (itemManager.items.size() + 1 >= ItemManager::LIMIT)
               character.data.itemSchema.sounds.dispose.play();
@@ -143,6 +169,14 @@ namespace game::state::main
               else if (eatSpeedBonus < 0)
                 ImGui::Text("Eat Speed Penalty: %0.2f%% / sec", *eatSpeedBonus);
             }
+
+            if (isPossibleToUpgrade)
+            {
+              ImGui::Text("Upgrade: %ix -> %s", *item.upgradeCount, schema.idToStringMap.at(*item.upgradeID).c_str());
+              if (isAbleToUpgrade)
+                ImGui::TextUnformatted("(Shift + Click -> Upgrade)\n(Shift + Ctrl + Click -> Upgrade All)");
+            }
+
             ImGui::PopStyleColor();
 
             ImGui::Separator();
diff --git a/src/state/main/menu.hpp b/src/state/main/menu.hpp
index 2766b80..e09222b 100644
--- a/src/state/main/menu.hpp
+++ b/src/state/main/menu.hpp
@@ -28,13 +28,13 @@ namespace game::state::main
     state::Configuration configuration;
 
 #if DEBUG
-    bool isCheats{true};
+    bool isCheats{};
     bool isDebug{true};
 #else
     bool isCheats{};
     bool isDebug{};
 #endif
-    
+
     bool isOpen{true};
     bool isChat{true};
     util::imgui::WindowSlide slide{};
diff --git a/src/state/main/world.cpp b/src/state/main/world.cpp
index 4ee0158..4e8c01e 100644
--- a/src/state/main/world.cpp
+++ b/src/state/main/world.cpp
@@ -22,13 +22,14 @@ namespace game::state::main
     auto& pan = canvas.pan;
     auto& zoom = canvas.zoom;
     auto& io = ImGui::GetIO();
-    bool isPan{true};
     auto isMouseMiddleDown = ImGui::IsMouseDown(ImGuiMouseButton_Middle);
+    auto isMouseLeftDown = ImGui::IsMouseDown(ImGuiMouseButton_Left);
+    auto isCtrlDown = ImGui::IsKeyDown(ImGuiMod_Ctrl);
     auto panMultiplier = ZOOM_BASE / zoom;
 
     if (!ImGui::IsWindowHovered(ImGuiHoveredFlags_AnyWindow) && !ImGui::IsAnyItemActive())
     {
-      if ((isMouseMiddleDown) && isPan)
+      if ((isMouseMiddleDown) || (isMouseLeftDown && isCtrlDown))
       {
         cursor.queue_play({cursorSchema.animations.pan.get()});
         pan -= imgui::to_vec2(io.MouseDelta) * panMultiplier;