diff --git a/GamecraftModdingAPI/Events/DeterministicStepComposeEngineGroupsPatch.cs b/GamecraftModdingAPI/Events/DeterministicStepComposeEngineGroupsPatch.cs
index d6e58dc..9f16955 100644
--- a/GamecraftModdingAPI/Events/DeterministicStepComposeEngineGroupsPatch.cs
+++ b/GamecraftModdingAPI/Events/DeterministicStepComposeEngineGroupsPatch.cs
@@ -18,7 +18,8 @@ namespace GamecraftModdingAPI.Events
     /// Patch of RobocraftX.StateSync.DeterministicStepCompositionRoot.ComposeEnginesGroups(...)
     /// </summary>
 	//[HarmonyPatch(typeof(DeterministicStepCompositionRoot), "DeterministicCompose")]
-	[HarmonyPatch]
+    [Obsolete]
+    [HarmonyPatch]
 	class GameHostTransitionDeterministicGroupEnginePatch
     {
 
diff --git a/GamecraftModdingAPI/Events/EmitterBuilder.cs b/GamecraftModdingAPI/Events/EmitterBuilder.cs
index 48a6cba..c6a6879 100644
--- a/GamecraftModdingAPI/Events/EmitterBuilder.cs
+++ b/GamecraftModdingAPI/Events/EmitterBuilder.cs
@@ -4,6 +4,7 @@ using Svelto.ECS;
 
 namespace GamecraftModdingAPI.Events
 {
+	[Obsolete]
     public class EmitterBuilder
     {
 		private string name;
diff --git a/GamecraftModdingAPI/Events/EventEngineFactory.cs b/GamecraftModdingAPI/Events/EventEngineFactory.cs
index f79dfca..7981303 100644
--- a/GamecraftModdingAPI/Events/EventEngineFactory.cs
+++ b/GamecraftModdingAPI/Events/EventEngineFactory.cs
@@ -11,6 +11,7 @@ namespace GamecraftModdingAPI.Events
     /// <summary>
     /// Convenient factories for mod event engines
     /// </summary>
+    [Obsolete]
     public static class EventEngineFactory
     {
         /// <summary>
diff --git a/GamecraftModdingAPI/Events/EventManager.cs b/GamecraftModdingAPI/Events/EventManager.cs
index efbf377..a1c757e 100644
--- a/GamecraftModdingAPI/Events/EventManager.cs
+++ b/GamecraftModdingAPI/Events/EventManager.cs
@@ -14,6 +14,7 @@ namespace GamecraftModdingAPI.Events
     /// Keeps track of event handlers and emitters.
     /// This is used to add, remove and get API event handlers and emitters.
     /// </summary>
+    [Obsolete]
     public static class EventManager
     {
         private static Dictionary<string, IEventEmitterEngine> _eventEmitters = new Dictionary<string, IEventEmitterEngine>();
diff --git a/GamecraftModdingAPI/Events/GameActivatedComposePatch.cs b/GamecraftModdingAPI/Events/GameActivatedComposePatch.cs
index 4481f4b..4142fb3 100644
--- a/GamecraftModdingAPI/Events/GameActivatedComposePatch.cs
+++ b/GamecraftModdingAPI/Events/GameActivatedComposePatch.cs
@@ -17,6 +17,7 @@ namespace GamecraftModdingAPI.Events
     /// <summary>
     /// Patch of RobocraftX.FullGameCompositionRoot.ActivateGame()
     /// </summary>
+    [Obsolete]
 	[HarmonyPatch]
     class GameActivatedComposePatch
     {
diff --git a/GamecraftModdingAPI/Events/GameReloadedPatch.cs b/GamecraftModdingAPI/Events/GameReloadedPatch.cs
index 40f46e1..7228084 100644
--- a/GamecraftModdingAPI/Events/GameReloadedPatch.cs
+++ b/GamecraftModdingAPI/Events/GameReloadedPatch.cs
@@ -14,6 +14,7 @@ namespace GamecraftModdingAPI.Events
     /// <summary>
     /// Patch of RobocraftX.FullGameCompositionRoot.ReloadGame()
     /// </summary>
+    [Obsolete]
     [HarmonyPatch(typeof(FullGameCompositionRoot), "ReloadGame")]
     class GameReloadedPatch
     {
diff --git a/GamecraftModdingAPI/Events/GameStateBuildEmitterEngine.cs b/GamecraftModdingAPI/Events/GameStateBuildEmitterEngine.cs
index a12433a..725f544 100644
--- a/GamecraftModdingAPI/Events/GameStateBuildEmitterEngine.cs
+++ b/GamecraftModdingAPI/Events/GameStateBuildEmitterEngine.cs
@@ -12,6 +12,7 @@ namespace GamecraftModdingAPI.Events
     /// <summary>
     /// Event emitter engine for switching to to build mode.
     /// </summary>
+    [Obsolete]
 	public class GameStateBuildEmitterEngine : IEventEmitterEngine, IUnorderedInitializeOnTimeStoppedModeEntered
 	{
 		public string Name { get; } = "GamecraftModdingAPIGameStateBuildEventEmitter" ;
diff --git a/GamecraftModdingAPI/Events/GameStateSimulationEmitterEngine.cs b/GamecraftModdingAPI/Events/GameStateSimulationEmitterEngine.cs
index 5689db9..6e6e2ce 100644
--- a/GamecraftModdingAPI/Events/GameStateSimulationEmitterEngine.cs
+++ b/GamecraftModdingAPI/Events/GameStateSimulationEmitterEngine.cs
@@ -12,6 +12,7 @@ namespace GamecraftModdingAPI.Events
     /// <summary>
     /// Event emitter engine for switching to simulation mode.
     /// </summary>
+    [Obsolete]
 	public class GameStateSimulationEmitterEngine : IEventEmitterEngine, IUnorderedInitializeOnTimeRunningModeEntered
 	{
 		public string Name { get; } = "GamecraftModdingAPIGameStateSimulationEventEmitter" ;
diff --git a/GamecraftModdingAPI/Events/GameSwitchedToPatch.cs b/GamecraftModdingAPI/Events/GameSwitchedToPatch.cs
index 30bb0d5..dbd63c0 100644
--- a/GamecraftModdingAPI/Events/GameSwitchedToPatch.cs
+++ b/GamecraftModdingAPI/Events/GameSwitchedToPatch.cs
@@ -18,6 +18,7 @@ namespace GamecraftModdingAPI.Events
     /// Patch of RobocraftX.FullGameCompositionRoot.ActivateGame()
 	/// (scheduled for execution during RobocraftX.FullGameCompositionRoot.SwitchToGame())
     /// </summary>
+    [Obsolete]
 	[HarmonyPatch(typeof(FullGameCompositionRoot), "SwitchToGame")]
     class GameSwitchedToPatch
     {
diff --git a/GamecraftModdingAPI/Events/HandlerBuilder.cs b/GamecraftModdingAPI/Events/HandlerBuilder.cs
index d5d9879..10f3290 100644
--- a/GamecraftModdingAPI/Events/HandlerBuilder.cs
+++ b/GamecraftModdingAPI/Events/HandlerBuilder.cs
@@ -4,6 +4,7 @@ using Svelto.ECS;
 
 namespace GamecraftModdingAPI.Events
 {
+	[Obsolete]
     public class HandlerBuilder
     {
 		private string name;
diff --git a/GamecraftModdingAPI/Events/IEventEmitterEngine.cs b/GamecraftModdingAPI/Events/IEventEmitterEngine.cs
index f6fefc5..8917cef 100644
--- a/GamecraftModdingAPI/Events/IEventEmitterEngine.cs
+++ b/GamecraftModdingAPI/Events/IEventEmitterEngine.cs
@@ -13,6 +13,7 @@ namespace GamecraftModdingAPI.Events
     /// <summary>
     /// Engine interface to create a ModEventEntityStruct in entitiesDB when a specific event occurs.
     /// </summary>
+    [Obsolete]
 	public interface IEventEmitterEngine : IFactoryEngine
     {
         /// <summary>
diff --git a/GamecraftModdingAPI/Events/IEventHandlerEngine.cs b/GamecraftModdingAPI/Events/IEventHandlerEngine.cs
index 34a14af..228adb8 100644
--- a/GamecraftModdingAPI/Events/IEventHandlerEngine.cs
+++ b/GamecraftModdingAPI/Events/IEventHandlerEngine.cs
@@ -14,6 +14,7 @@ namespace GamecraftModdingAPI.Events
     /// <summary>
     /// Engine interface to handle ModEventEntityStruct events emitted by IEventEmitterEngines.
     /// </summary>
+    [Obsolete]
 	public interface IEventHandlerEngine : IReactionaryEngine<ModEventEntityStruct>
     {
     }
diff --git a/GamecraftModdingAPI/Events/MenuActivatedPatch.cs b/GamecraftModdingAPI/Events/MenuActivatedPatch.cs
index 4237faa..382bac4 100644
--- a/GamecraftModdingAPI/Events/MenuActivatedPatch.cs
+++ b/GamecraftModdingAPI/Events/MenuActivatedPatch.cs
@@ -15,6 +15,7 @@ namespace GamecraftModdingAPI.Events
     /// <summary>
     /// Patch of RobocraftX.FullGameCompositionRoot.ActivateMenu()
     /// </summary>
+    [Obsolete]
     [HarmonyPatch(typeof(FullGameCompositionRoot), "ActivateMenu")]
     class MenuActivatedPatch
     {
diff --git a/GamecraftModdingAPI/Events/MenuSwitchedToPatch.cs b/GamecraftModdingAPI/Events/MenuSwitchedToPatch.cs
index 52a00b2..30b84da 100644
--- a/GamecraftModdingAPI/Events/MenuSwitchedToPatch.cs
+++ b/GamecraftModdingAPI/Events/MenuSwitchedToPatch.cs
@@ -15,6 +15,7 @@ namespace GamecraftModdingAPI.Events
     /// <summary>
     /// Patch of RobocraftX.FullGameCompositionRoot.SwitchToMenu()
     /// </summary>
+    [Obsolete]
     [HarmonyPatch(typeof(FullGameCompositionRoot), "SwitchToMenu")]
     class MenuSwitchedToPatch
     {
diff --git a/GamecraftModdingAPI/Events/SimpleEventEmitterEngine.cs b/GamecraftModdingAPI/Events/SimpleEventEmitterEngine.cs
index 0e51823..0ea8170 100644
--- a/GamecraftModdingAPI/Events/SimpleEventEmitterEngine.cs
+++ b/GamecraftModdingAPI/Events/SimpleEventEmitterEngine.cs
@@ -12,6 +12,7 @@ namespace GamecraftModdingAPI.Events
     /// <summary>
     /// A simple implementation of IEventEmitterEngine sufficient for most uses
     /// </summary>
+    [Obsolete]
     public class SimpleEventEmitterEngine : IEventEmitterEngine
     {
         public string Name { get; set; }
diff --git a/GamecraftModdingAPI/Events/SimpleEventHandlerEngine.cs b/GamecraftModdingAPI/Events/SimpleEventHandlerEngine.cs
index 18314d9..ebce21d 100644
--- a/GamecraftModdingAPI/Events/SimpleEventHandlerEngine.cs
+++ b/GamecraftModdingAPI/Events/SimpleEventHandlerEngine.cs
@@ -13,6 +13,7 @@ namespace GamecraftModdingAPI.Events
     /// <summary>
     /// A simple implementation of IEventHandlerEngine sufficient for most uses
     /// </summary>
+    [Obsolete]
     public class SimpleEventHandlerEngine : IEventHandlerEngine
     {
         public int type { get; set; }
diff --git a/GamecraftModdingAPI/Utility/VersionTracking.cs b/GamecraftModdingAPI/Utility/VersionTracking.cs
index 780ac38..32b86dc 100644
--- a/GamecraftModdingAPI/Utility/VersionTracking.cs
+++ b/GamecraftModdingAPI/Utility/VersionTracking.cs
@@ -14,6 +14,7 @@ namespace GamecraftModdingAPI.Utility
     /// Tracks the API version the current game was built for.
 	/// For compatibility reasons, this must be enabled before it will work.
     /// </summary>
+    [Obsolete]
 	public static class VersionTracking
 	{
 		private static readonly VersionTrackingEngine versionEngine = new VersionTrackingEngine();
@@ -58,6 +59,7 @@ namespace GamecraftModdingAPI.Utility
 
 	}
 
+    [Obsolete]
 	internal class VersionTrackingEngine : IEventEmitterEngine
 	{
 		public string Name { get; } = "GamecraftModdingAPIVersionTrackingGameEngine";
@@ -94,11 +96,13 @@ namespace GamecraftModdingAPI.Utility
 		public void Emit() { }
 	}
 
+	[Obsolete]
 	public struct ModVersionStruct : IEntityComponent
 	{
 		public uint version;
 	}
 
+	[Obsolete]
 	public class ModVersionDescriptor: SerializableEntityDescriptor<ModVersionDescriptor._ModVersionDescriptor>
 	{
 		[HashName("GamecraftModdingAPIVersionV0")]