diff --git a/CMakeLists.txt b/CMakeLists.txt
index 52ce7d3..3c26029 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -39,6 +39,7 @@ set(SMOKE_API_SOURCES
     src/steam_api/virtuals/isteamhttp.cpp
     src/steam_api/virtuals/isteaminventory.cpp
     src/steam_api/virtuals/isteamuser.cpp
+    src/steam_api/virtuals/isteamutils.cpp
     src/steam_api/virtuals/steam_api_virtuals.hpp
     src/steam_api/steam_client.hpp
     src/steam_api/steam_client.cpp
diff --git a/KoalaBox b/KoalaBox
index dbe840c..30227ef 160000
--- a/KoalaBox
+++ b/KoalaBox
@@ -1 +1 @@
-Subproject commit dbe840c569f7b78881fb90bdd765d553e8ed5084
+Subproject commit 30227ef32ec22b64a4140095cd3a3849bfd9be98
diff --git a/src/smoke_api/smoke_api.cpp b/src/smoke_api/smoke_api.cpp
index 2d99e7b..6932236 100644
--- a/src/smoke_api/smoke_api.cpp
+++ b/src/smoke_api/smoke_api.cpp
@@ -16,6 +16,7 @@
 #include "smoke_api/config.hpp"
 #include "smoke_api/steamclient/steamclient.hpp"
 #include "steam_api/steam_interfaces.hpp"
+#include "steam_api/virtuals/steam_api_virtuals.hpp"
 
 #include "build_config.h"
 
@@ -179,14 +180,46 @@ namespace smoke_api {
     }
 
     AppId_t get_app_id() {
+        static AppId_t app_id = 0;
+        if(app_id) {
+            return app_id; // cached value
+        }
+
         try {
-            const auto* const app_id_str = std::getenv("SteamAppId");
-            if(app_id_str == nullptr) {
-                LOG_WARN("No SteamAppId is set in current environment");
+            if(const auto app_id_str = kb::util::get_env("SteamAppId")) {
+                app_id = std::stoi(*app_id_str);
+                LOG_DEBUG("Found AppID from environment: {}", app_id);
+
+                return app_id;
+            }
+        } catch(std::exception&) {
+            LOG_WARN("No SteamAppId in environment. Falling back to ISteamUtils::GetAppID.");
+        }
+
+        // TODO: Then try to read steam_appid.txt here. SteamAppId env var is not available when it's present.
+
+        try {
+            DECLARE_ARGS();
+
+            THIS = CreateInterface("SteamClient007", nullptr);
+            if(!THIS) {
+                LOG_ERROR("Failed to create SteamClient interface");
                 return 0;
             }
 
-            static auto app_id = std::stoi(app_id_str);
+            THIS = ISteamClient_GetISteamGenericInterface(ARGS(1, 1, "SteamUtils002"));
+            if(!THIS) {
+                LOG_ERROR("Failed to get SteamUtils interface");
+                return 0;
+            }
+
+            app_id = ISteamUtils_GetAppID(ARGS());
+            if(!app_id) {
+                LOG_ERROR("ISteamUtils::GetAppID returned 0");
+                return 0;
+            }
+
+            LOG_DEBUG("Found AppID from ISteamUtils: {}", app_id);
             return app_id;
         } catch(const std::exception& e) {
             LOG_ERROR("Failed to get app id: {}", e.what());
diff --git a/src/smoke_api/smoke_api.hpp b/src/smoke_api/smoke_api.hpp
index bbba2fb..5eb4dd2 100644
--- a/src/smoke_api/smoke_api.hpp
+++ b/src/smoke_api/smoke_api.hpp
@@ -6,6 +6,7 @@ constexpr auto STEAM_APPS = "STEAMAPPS_INTERFACE_VERSION";
 constexpr auto STEAM_CLIENT = "SteamClient";
 constexpr auto STEAM_HTTP = "STEAMHTTP_INTERFACE_VERSION";
 constexpr auto STEAM_USER = "SteamUser";
+constexpr auto STEAM_UTILS = "SteamUtils";
 constexpr auto STEAM_INVENTORY = "STEAMINVENTORY_INTERFACE_V";
 constexpr auto STEAM_GAME_SERVER = "SteamGameServer";
 
diff --git a/src/steam_api/steam_interfaces.cpp b/src/steam_api/steam_interfaces.cpp
index a7d95d5..cc467be 100644
--- a/src/steam_api/steam_interfaces.cpp
+++ b/src/steam_api/steam_interfaces.cpp
@@ -4,12 +4,12 @@
 
 #include <koalabox/hook.hpp>
 #include <koalabox/logger.hpp>
+#include "koalabox/lib.hpp"
+
+#include "smoke_api/steamclient/steamclient.hpp"
 
 #include "steam_api/steam_interfaces.hpp"
-
-#include "koalabox/lib.hpp"
 #include "smoke_api/smoke_api.hpp"
-#include "smoke_api/steamclient/steamclient.hpp"
 #include "virtuals/steam_api_virtuals.hpp"
 
 namespace {
@@ -104,6 +104,15 @@ namespace {
                     }
                 }
             },
+            {
+                STEAM_UTILS,
+                interface_data_t{
+                    .fallback_version = "SteamUtils009",
+                    .entry_map = {
+                        ENTRY(ISteamUtils, GetAppID),
+                    }
+                }
+            },
         };
     }
 
@@ -210,7 +219,9 @@ namespace steam_interfaces {
             const auto prefixes = std::views::keys(virtual_hook_map) | std::ranges::to<std::set>();
 
             const auto CreateInterface$ = KB_MOD_GET_FUNC(steamclient_handle, CreateInterface);
-            const auto* const THIS = CreateInterface$(steam_client_interface_version.c_str(), nullptr);
+
+            DECLARE_ARGS();
+            THIS = CreateInterface$(steam_client_interface_version.c_str(), nullptr);
             hook_virtuals(THIS, steam_client_interface_version);
 
             const auto interface_lookup = read_interface_lookup();
@@ -234,7 +245,6 @@ namespace steam_interfaces {
                     continue;
                 }
 
-                DECLARE_EDX();
                 const auto* const interface_ptr = ISteamClient_GetISteamGenericInterface(
                     ARGS(steam_user, steam_pipe, interface_version.c_str())
                 );
diff --git a/src/steam_api/steam_interfaces.hpp b/src/steam_api/steam_interfaces.hpp
index 6fa5ebc..0c483bf 100644
--- a/src/steam_api/steam_interfaces.hpp
+++ b/src/steam_api/steam_interfaces.hpp
@@ -1,6 +1,6 @@
 #pragma once
 
-#include "smoke_api/types.hpp"
+#include <string>
 
 namespace steam_interfaces {
     void hook_virtuals(const void* interface_ptr, const std::string& version_string);
diff --git a/src/steam_api/virtuals/isteamutils.cpp b/src/steam_api/virtuals/isteamutils.cpp
new file mode 100644
index 0000000..cab05bb
--- /dev/null
+++ b/src/steam_api/virtuals/isteamutils.cpp
@@ -0,0 +1,9 @@
+#include <koalabox/logger.hpp>
+
+#include "smoke_api/smoke_api.hpp"
+#include "smoke_api/interfaces/steam_user.hpp"
+#include "steam_api/virtuals/steam_api_virtuals.hpp"
+
+VIRTUAL(AppId_t) ISteamUtils_GetAppID(PARAMS()) noexcept {
+    SWAPPED_CALL(THIS, ISteamUtils_GetAppID, ARGS());
+}
diff --git a/src/steam_api/virtuals/steam_api_virtuals.hpp b/src/steam_api/virtuals/steam_api_virtuals.hpp
index b481475..3730566 100644
--- a/src/steam_api/virtuals/steam_api_virtuals.hpp
+++ b/src/steam_api/virtuals/steam_api_virtuals.hpp
@@ -11,21 +11,11 @@ VIRTUAL(bool) ISteamApps_BGetDLCDataByIndex(PARAMS(int, AppId_t*, bool*, char*,
 // ISteamClient
 VIRTUAL(void*) ISteamClient_GetISteamApps(PARAMS(HSteamUser, HSteamPipe, const char*)) noexcept;
 VIRTUAL(void*) ISteamClient_GetISteamUser(PARAMS(HSteamUser, HSteamPipe, const char*)) noexcept;
-VIRTUAL(void*) ISteamClient_GetISteamGenericInterface(
-    PARAMS(HSteamUser, HSteamPipe, const char*)
-
-
-) noexcept;
-VIRTUAL(void*) ISteamClient_GetISteamInventory(
-    PARAMS(HSteamUser, HSteamPipe, const char*)
-
-
-) noexcept;
+VIRTUAL(void*) ISteamClient_GetISteamGenericInterface(PARAMS(HSteamUser, HSteamPipe, const char*)) noexcept;
+VIRTUAL(void*) ISteamClient_GetISteamInventory(PARAMS(HSteamUser, HSteamPipe, const char*)) noexcept;
 
 // ISteamHTTP
-VIRTUAL(bool) ISteamHTTP_GetHTTPResponseBodyData(
-    PARAMS(HTTPRequestHandle, const uint8_t*, uint32_t)
-) noexcept;
+VIRTUAL(bool) ISteamHTTP_GetHTTPResponseBodyData(PARAMS(HTTPRequestHandle, const uint8_t*, uint32_t)) noexcept;
 VIRTUAL(bool) ISteamHTTP_GetHTTPStreamingResponseBodyData(
     PARAMS(HTTPRequestHandle, uint32_t, const uint8_t*, uint32_t)
 ) noexcept;
@@ -38,7 +28,6 @@ VIRTUAL(EResult) ISteamInventory_GetResultStatus(PARAMS(SteamInventoryResult_t))
 VIRTUAL(bool) ISteamInventory_GetResultItems(
     PARAMS(SteamInventoryResult_t, SteamItemDetails_t*, uint32_t*) // @formatter:off
 ) noexcept; // @formatter:on
-
 VIRTUAL(bool) ISteamInventory_GetResultItemProperty(
     PARAMS(SteamInventoryResult_t, uint32_t, const char*, char*, uint32_t*) // @formatter:off
 ) noexcept; // @formatter:on
@@ -46,20 +35,15 @@ VIRTUAL(bool) ISteamInventory_GetAllItems(PARAMS(SteamInventoryResult_t*)) noexc
 VIRTUAL(bool) ISteamInventory_GetItemsByID(
     PARAMS(SteamInventoryResult_t*, const SteamItemInstanceID_t*, uint32_t)
 ) noexcept;
-VIRTUAL(bool) ISteamInventory_SerializeResult(
-    PARAMS(SteamInventoryResult_t, void*, uint32_t*)
-
-
-) noexcept;
+VIRTUAL(bool) ISteamInventory_SerializeResult(PARAMS(SteamInventoryResult_t, void*, uint32_t*)) noexcept;
 VIRTUAL(bool) ISteamInventory_GetItemDefinitionIDs(PARAMS(SteamItemDef_t*, uint32_t*)) noexcept;
 VIRTUAL(bool) ISteamInventory_CheckResultSteamID(PARAMS(SteamInventoryResult_t, CSteamID)) noexcept;
 
 // ISteamUser
-VIRTUAL(EUserHasLicenseForAppResult) ISteamUser_UserHasLicenseForApp(
-    PARAMS(CSteamID, AppId_t)
-) noexcept;
+VIRTUAL(EUserHasLicenseForAppResult) ISteamUser_UserHasLicenseForApp(PARAMS(CSteamID, AppId_t)) noexcept;
+
+// ISteamUtils
+VIRTUAL(AppId_t) ISteamUtils_GetAppID(PARAMS()) noexcept;
 
 // ISteamGameServer
-VIRTUAL(EUserHasLicenseForAppResult) ISteamGameServer_UserHasLicenseForApp(
-    PARAMS(CSteamID, AppId_t)
-) noexcept;
+VIRTUAL(EUserHasLicenseForAppResult) ISteamGameServer_UserHasLicenseForApp(PARAMS(CSteamID, AppId_t)) noexcept;
diff --git a/static/smoke_api/types.hpp b/static/smoke_api/types.hpp
index 4daa087..ffad415 100644
--- a/static/smoke_api/types.hpp
+++ b/static/smoke_api/types.hpp
@@ -46,12 +46,12 @@
 #define PARAMS(...) const void* RCX __VA_OPT__(,) __VA_ARGS__
 #define ARGS(...) RCX __VA_OPT__(,) __VA_ARGS__
 #define THIS RCX
-#define DECLARE_EDX()
+#define DECLARE_ARGS() const void* RCX = nullptr;
 #else
 #define PARAMS(...) const void* ECX, const void* EDX __VA_OPT__(,) __VA_ARGS__
 #define ARGS(...) ECX, EDX __VA_OPT__(,) __VA_ARGS__
 #define THIS ECX
-#define DECLARE_EDX() const void* EDX = nullptr;
+#define DECLARE_ARGS() const void* ECX = nullptr; const void* EDX = nullptr;
 #endif
 
 using AppId_t = uint32_t;
@@ -112,8 +112,9 @@ public:
 
     explicit DLC() = default;
 
-    explicit DLC(std::string appid, std::string name) : appid{std::move(appid)},
-                                                        name{std::move(name)} {}
+    explicit DLC(std::string appid, std::string name)
+    : appid{std::move(appid)},
+      name{std::move(name)} {}
 
     [[nodiscard]] std::string get_id_str() const {
         return appid;