diff --git a/regression/CMakeLists.txt b/regression/CMakeLists.txt
index 340e29c2d9..a02a538e17 100644
--- a/regression/CMakeLists.txt
+++ b/regression/CMakeLists.txt
@@ -22,3 +22,4 @@
 
     add_subdirectory(regression)
     add_subdirectory(stationlist)
+    add_subdirectory(gs)
diff --git a/regression/gs/CMakeLists.txt b/regression/gs/CMakeLists.txt
new file mode 100644
index 0000000000..e25b8642b0
--- /dev/null
+++ b/regression/gs/CMakeLists.txt
@@ -0,0 +1,8 @@
+include(CreateRegression)
+create_regression("game"
+    ${CMAKE_CURRENT_SOURCE_DIR}/info.nut
+    ${CMAKE_CURRENT_SOURCE_DIR}/main.nut
+    ${CMAKE_CURRENT_SOURCE_DIR}/require.nut
+    ${CMAKE_CURRENT_SOURCE_DIR}/result.txt
+    ${CMAKE_CURRENT_SOURCE_DIR}/test.sav
+)
diff --git a/regression/gs/info.nut b/regression/gs/info.nut
new file mode 100644
index 0000000000..57647bc67c
--- /dev/null
+++ b/regression/gs/info.nut
@@ -0,0 +1,14 @@
+class Regression extends GSInfo {
+	function GetAuthor()      { return "OpenTTD GS Developers Team"; }
+	function GetName()        { return "Regression"; }
+	function GetShortName()   { return "REGR"; }
+	function GetDescription() { return "This runs regression-tests on some commands. On the same map the result should always be the same."; }
+	function GetVersion()     { return 1; }
+	function GetAPIVersion()  { return "16"; }
+	function GetDate()        { return "2026-05-19"; }
+	function CreateInstance() { return "Regression"; }
+	function UseAsRandomAI()  { return false; }
+}
+
+RegisterGS(Regression());
+
diff --git a/regression/gs/main.nut b/regression/gs/main.nut
new file mode 100644
index 0000000000..0a991ee5fb
--- /dev/null
+++ b/regression/gs/main.nut
@@ -0,0 +1,83 @@
+class Regression extends GSController {
+	function Start();
+};
+
+
+
+function Regression::TestInit()
+{
+	print("");
+	print("--TestInit--");
+	print(" Ops:      " + this.GetOpsTillSuspend());
+	print(" TickTest: " + this.GetTick());
+	this.Sleep(1);
+	print(" TickTest: " + this.GetTick());
+	print(" Ops:      " + this.GetOpsTillSuspend());
+	print(" SetCommandDelay: " + GSController.SetCommandDelay(1));
+	print(" IsValid(vehicle.plane_speed): " + GSGameSettings.IsValid("vehicle.plane_speed"));
+	print(" vehicle.plane_speed: " + GSGameSettings.GetValue("vehicle.plane_speed"));
+	require("require.nut");
+	print(" TestEnum.value1: " + ::TestEnum.value1);
+	print(" test_constant: " + ::test_constant);
+	print(" TestEnum.value2: " + TestEnum.value2);
+	print(" test_constant: " + test_constant);
+	print(" min(6, 3): " + min(6, 3));
+	print(" min(3, 6): " + min(3, 6));
+	print(" max(6, 3): " + max(6, 3));
+	print(" max(3, 6): " + max(3, 6));
+}
+
+function Regression::Company()
+{
+	print("");
+	print("--Company--");
+
+	/* Test GSXXXMode() in scopes */
+	{
+		local test = GSTestMode();
+		print("  SetName():            " + GSCompany.SetName("Regression"));
+		print("  SetName():            " + GSCompany.SetName("Regression"));
+		{
+			local exec = GSExecMode();
+			print("  SetName():            " + GSCompany.SetName("Regression"));
+			print("  SetName():            " + GSCompany.SetName("Regression"));
+			print("  GetLastErrorString(): " + GSError.GetLastErrorString());
+		}
+	}
+
+	print("  GetName():                         " + GSCompany.GetName(GSCompany.COMPANY_SELF));
+	print("  GetPresidentName():                " + GSCompany.GetPresidentName(GSCompany.COMPANY_SELF));
+	print("  SetPresidentName():                " + GSCompany.SetPresidentName("Regression GS"));
+	print("  GetPresidentName():                " + GSCompany.GetPresidentName(GSCompany.COMPANY_SELF));
+
+	print("");
+	print("--CompanyMode--");
+
+	local company = GSCompanyMode(GSCompany.COMPANY_FIRST);
+	{
+		local test = GSTestMode();
+		print("  SetName():            " + GSCompany.SetName("Regression"));
+		print("  SetName():            " + GSCompany.SetName("Regression"));
+		{
+			local exec = GSExecMode();
+			print("  SetName():            " + GSCompany.SetName("Regression"));
+			print("  SetName():            " + GSCompany.SetName("Regression"));
+			print("  GetLastErrorString(): " + GSError.GetLastErrorString());
+		}
+	}
+
+	print("  GetName():                         " + GSCompany.GetName(GSCompany.COMPANY_SELF));
+	print("  GetPresidentName():                " + GSCompany.GetPresidentName(GSCompany.COMPANY_SELF));
+	print("  SetPresidentName():                " + GSCompany.SetPresidentName("Regression GS"));
+	print("  GetPresidentName():                " + GSCompany.GetPresidentName(GSCompany.COMPANY_SELF));
+}
+
+function Regression::Start()
+{
+	this.TestInit();
+	this.Company();
+
+	print("");
+	print("Done...");
+	print("");
+}
diff --git a/regression/gs/require.nut b/regression/gs/require.nut
new file mode 100644
index 0000000000..872a929a5f
--- /dev/null
+++ b/regression/gs/require.nut
@@ -0,0 +1,9 @@
+print("  Required this file");
+
+const test_constant = 1;
+
+enum TestEnum {
+	value0,
+	value1,
+	value2
+};
diff --git a/regression/gs/result.txt b/regression/gs/result.txt
new file mode 100644
index 0000000000..03cd98fb1b
--- /dev/null
+++ b/regression/gs/result.txt
@@ -0,0 +1,44 @@
+
+--TestInit--
+ Ops:      9988
+ TickTest: 1
+ TickTest: 2
+ Ops:      9990
+ SetCommandDelay: (null : 0x00000000)
+ IsValid(vehicle.plane_speed): true
+ vehicle.plane_speed: 4
+  Required this file
+ TestEnum.value1: 1
+ test_constant: 1
+ TestEnum.value2: 2
+ test_constant: 1
+ min(6, 3): 3
+ min(3, 6): 3
+ max(6, 3): 6
+ max(3, 6): 6
+
+--Company--
+  SetName():            false
+  SetName():            false
+  SetName():            false
+  SetName():            false
+  GetLastErrorString(): ERR_PRECONDITION_INVALID_COMPANY
+  GetName():                         (null : 0x00000000)
+  GetPresidentName():                (null : 0x00000000)
+  SetPresidentName():                false
+  GetPresidentName():                (null : 0x00000000)
+
+--CompanyMode--
+  SetName():            true
+  SetName():            true
+  SetName():            true
+  SetName():            false
+  GetLastErrorString(): ERR_NAME_IS_NOT_UNIQUE
+  GetName():                         Regression
+  GetPresidentName():                S. G. Bloggs
+  SetPresidentName():                true
+  GetPresidentName():                Regression GS
+
+Done...
+
+ERROR: The script died unexpectedly.
diff --git a/regression/gs/test.sav b/regression/gs/test.sav
new file mode 100644
index 0000000000..ff654e0cd4
Binary files /dev/null and b/regression/gs/test.sav differ