diff --git a/minecraft/platform/IPlatformNetwork.h b/minecraft/platform/IPlatformNetwork.h
new file mode 100644
index 000000000..675a2e0a6
--- /dev/null
+++ b/minecraft/platform/IPlatformNetwork.h
@@ -0,0 +1,92 @@
+#pragma once
+
+#include <cstdint>
+#include <string>
+#include <vector>
+
+#include "../4J.Common/4J_Compat.h"
+
+class INetworkPlayer;
+class ClientConnection;
+class Minecraft;
+class CGameNetworkManager;
+struct FriendSessionInfo;
+using SessionID = uint64_t;
+
+class IPlatformNetwork {
+public:
+    enum eJoinFailedReason {
+        JOIN_FAILED_SERVER_FULL,
+        JOIN_FAILED_INSUFFICIENT_PRIVILEGES,
+        JOIN_FAILED_NONSPECIFIC,
+    };
+
+    virtual ~IPlatformNetwork() = default;
+
+    virtual bool Initialise(CGameNetworkManager* pGameNetworkManager,
+                            int flagIndexSize) = 0;
+    virtual void Terminate() = 0;
+    virtual void DoWork() = 0;
+
+    // Players
+    virtual int GetPlayerCount() = 0;
+    virtual int GetOnlinePlayerCount() = 0;
+    virtual int GetLocalPlayerMask(int playerIndex) = 0;
+    virtual bool AddLocalPlayerByUserIndex(int userIndex) = 0;
+    virtual bool RemoveLocalPlayerByUserIndex(int userIndex) = 0;
+    virtual INetworkPlayer* GetLocalPlayerByUserIndex(int userIndex) = 0;
+    virtual INetworkPlayer* GetPlayerByIndex(int playerIndex) = 0;
+    virtual INetworkPlayer* GetPlayerByXuid(PlayerUID xuid) = 0;
+    virtual INetworkPlayer* GetPlayerBySmallId(unsigned char smallId) = 0;
+    virtual INetworkPlayer* GetHostPlayer() = 0;
+    virtual bool ShouldMessageForFullSession() = 0;
+
+    // Session
+    virtual bool IsHost() = 0;
+    virtual bool IsInSession() = 0;
+    virtual bool IsInGameplay() = 0;
+    virtual bool IsReadyToPlayOrIdle() = 0;
+    virtual bool IsInStatsEnabledSession() = 0;
+    virtual bool SessionHasSpace(unsigned int spaceRequired = 1) = 0;
+    virtual bool IsAddingPlayer() = 0;
+    virtual bool IsLocalGame() = 0;
+    virtual void SetLocalGame(bool isLocal) = 0;
+    virtual bool IsPrivateGame() = 0;
+    virtual void SetPrivateGame(bool isPrivate) = 0;
+    virtual bool IsLeavingGame() = 0;
+    virtual void ResetLeavingGame() = 0;
+
+    // Hosting / joining
+    virtual void HostGame(int localUsersMask, bool bOnlineGame, bool bIsPrivate,
+                          unsigned char publicSlots, unsigned char privateSlots) = 0;
+    virtual int JoinGame(FriendSessionInfo* searchResult, int dwLocalUsersMask,
+                         int dwPrimaryUserIndex) = 0;
+    virtual void CancelJoinGame() {}
+    virtual bool LeaveGame(bool bMigrateHost) = 0;
+    virtual void SendInviteGUI(int quadrant) = 0;
+    virtual int GetJoiningReadyPercentage() = 0;
+
+    // Callbacks
+    virtual void RegisterPlayerChangedCallback(
+        int iPad,
+        void (*callback)(void*, INetworkPlayer*, bool),
+        void* callbackParam) = 0;
+    virtual void UnRegisterPlayerChangedCallback(
+        int iPad,
+        void (*callback)(void*, INetworkPlayer*, bool),
+        void* callbackParam) = 0;
+
+    virtual void HandleSignInChange() = 0;
+
+    // Stats
+    virtual std::wstring GatherStats() = 0;
+    virtual std::wstring GatherRTTStats() = 0;
+
+    // Session list
+    virtual std::vector<FriendSessionInfo*>* GetSessionList(int iPad,
+                                                            int localPlayers,
+                                                            bool partyOnly) = 0;
+    virtual void SetSessionsUpdatedCallback(
+        void (*SessionsUpdatedCallback)(void*), void* pSearchParam) = 0;
+    virtual void ForceFriendsSessionRefresh() = 0;
+};
diff --git a/minecraft/platform/IPlatformSound.h b/minecraft/platform/IPlatformSound.h
new file mode 100644
index 000000000..10a7b1d29
--- /dev/null
+++ b/minecraft/platform/IPlatformSound.h
@@ -0,0 +1,38 @@
+#pragma once
+
+#include <memory>
+#include <string>
+
+class File;
+class Mob;
+class Options;
+
+class IPlatformSound {
+public:
+    virtual ~IPlatformSound() = default;
+
+    virtual void init(Options*) = 0;
+    virtual void destroy() = 0;
+    virtual void tick(std::shared_ptr<Mob>* players, float a) = 0;
+
+    // SFX
+    virtual void play(int iSound, float x, float y, float z, float volume,
+                      float pitch) = 0;
+    virtual void playUI(int iSound, float volume, float pitch) = 0;
+
+    // Streaming / music
+    virtual void playStreaming(const std::wstring& name, float x, float y,
+                               float z, float volume, float pitch,
+                               bool bMusicDelay = true) = 0;
+    virtual void playMusicTick() = 0;
+    virtual void updateMusicVolume(float fVal) = 0;
+    virtual void updateSystemMusicPlaying(bool isPlaying) = 0;
+    virtual void updateSoundEffectVolume(float fVal) = 0;
+
+    // Asset registration
+    virtual void add(const std::wstring& name, File* file) = 0;
+    virtual void addMusic(const std::wstring& name, File* file) = 0;
+    virtual void addStreaming(const std::wstring& name, File* file) = 0;
+    virtual char* ConvertSoundPathToName(const std::wstring& name,
+                                         bool bConvertSpaces = false) = 0;
+};
diff --git a/minecraft/platform/IPlatformUIController.h b/minecraft/platform/IPlatformUIController.h
new file mode 100644
index 000000000..fd2f074ae
--- /dev/null
+++ b/minecraft/platform/IPlatformUIController.h
@@ -0,0 +1,112 @@
+#pragma once
+
+#include <string>
+
+#include "IPlatformStorage.h"
+
+// Forward declarations for game types used by the UI interface.
+// Full definitions live in the Client module.
+enum EUIScene : int;
+enum EUILayer : int;
+enum EUIGroup : int;
+enum ESoundEffect : int;
+struct TutorialPopupInfo;
+
+class IPlatformUIController {
+public:
+    virtual ~IPlatformUIController() = default;
+
+    virtual void tick() = 0;
+    virtual void render() = 0;
+
+    // Skin
+    virtual void StartReloadSkinThread() = 0;
+    virtual bool IsReloadingSkin() = 0;
+    virtual void CleanUpSkinReload() = 0;
+
+    // Navigation
+    virtual bool NavigateToScene(int iPad, EUIScene scene,
+                                 void* initData = nullptr,
+                                 EUILayer layer = static_cast<EUILayer>(0),
+                                 EUIGroup group = static_cast<EUIGroup>(0)) = 0;
+    virtual bool NavigateBack(int iPad, bool forceUsePad = false,
+                              EUIScene eScene = static_cast<EUIScene>(-1),
+                              EUILayer eLayer = static_cast<EUILayer>(-1)) = 0;
+    virtual void CloseUIScenes(int iPad, bool forceIPad = false) = 0;
+    virtual void CloseAllPlayersScenes() = 0;
+
+    // Menu state
+    virtual bool IsPauseMenuDisplayed(int iPad) = 0;
+    virtual bool IsContainerMenuDisplayed(int iPad) = 0;
+    virtual bool IsIgnorePlayerJoinMenuDisplayed(int iPad) = 0;
+    virtual bool IsIgnoreAutosaveMenuDisplayed(int iPad) = 0;
+    virtual void SetIgnoreAutosaveMenuDisplayed(int iPad, bool displayed) = 0;
+    virtual bool IsSceneInStack(int iPad, EUIScene eScene) = 0;
+    virtual bool GetMenuDisplayed(int iPad) = 0;
+    virtual void CheckMenuDisplayed() = 0;
+
+    // Tooltips
+    virtual void SetTooltipText(unsigned int iPad, unsigned int tooltip,
+                                int iTextID) = 0;
+    virtual void SetEnableTooltips(unsigned int iPad, bool bVal) = 0;
+    virtual void ShowTooltip(unsigned int iPad, unsigned int tooltip,
+                             bool show) = 0;
+    virtual void SetTooltips(unsigned int iPad, int iA, int iB = -1,
+                             int iX = -1, int iY = -1, int iLT = -1,
+                             int iRT = -1, int iLB = -1, int iRB = -1,
+                             int iLS = -1, int iRS = -1, int iBack = -1,
+                             bool forceUpdate = false) = 0;
+    virtual void EnableTooltip(unsigned int iPad, unsigned int tooltip,
+                               bool enable) = 0;
+    virtual void RefreshTooltips(unsigned int iPad) = 0;
+
+    // Sound
+    virtual void PlayUISFX(ESoundEffect eSound) = 0;
+
+    // Debug
+    virtual void ShowUIDebugConsole(bool show) {}
+    virtual void ShowUIDebugMarketingGuide(bool show) {}
+
+    // HUD
+    virtual void DisplayGamertag(unsigned int iPad, bool show) = 0;
+    virtual void SetSelectedItem(unsigned int iPad,
+                                 const std::wstring& name) = 0;
+    virtual void UpdateSelectedItemPos(unsigned int iPad) = 0;
+
+    // Events
+    virtual void HandleDLCMountingComplete() = 0;
+    virtual void HandleDLCInstalled(int iPad) = 0;
+    virtual void HandleTMSDLCFileRetrieved(int iPad) = 0;
+    virtual void HandleTMSBanFileRetrieved(int iPad) = 0;
+    virtual void HandleInventoryUpdated(int iPad) = 0;
+    virtual void HandleGameTick() = 0;
+
+    // Tutorial
+    virtual void SetTutorialDescription(int iPad, TutorialPopupInfo* info) = 0;
+    virtual void SetTutorialVisible(int iPad, bool visible) = 0;
+    virtual bool IsTutorialVisible(int iPad) = 0;
+
+    // Layout
+    virtual void UpdatePlayerBasePositions() = 0;
+    virtual void SetEmptyQuadrantLogo(int iSection) = 0;
+    virtual void HideAllGameUIElements() = 0;
+    virtual void ShowOtherPlayersBaseScene(unsigned int iPad, bool show) = 0;
+
+    // Trial timer
+    virtual void ShowTrialTimer(bool show) = 0;
+    virtual void SetTrialTimerLimitSecs(unsigned int uiSeconds) = 0;
+    virtual void UpdateTrialTimer(unsigned int iPad) = 0;
+    virtual void ReduceTrialTimerValue() = 0;
+
+    // Autosave
+    virtual void ShowAutosaveCountdownTimer(bool show) = 0;
+    virtual void UpdateAutosaveCountdownTimer(unsigned int uiSeconds) = 0;
+    virtual void ShowSavingMessage(unsigned int iPad,
+                                   IPlatformStorage::ESavingMessage eVal) = 0;
+
+    // Start screen
+    virtual bool PressStartPlaying(unsigned int iPad) = 0;
+    virtual void ShowPressStart(unsigned int iPad) = 0;
+
+    virtual void SetWinUserIndex(unsigned int iPad) = 0;
+};
diff --git a/minecraft/platform/Platform.h b/minecraft/platform/Platform.h
index 2790f6514..14d7b877e 100644
--- a/minecraft/platform/Platform.h
+++ b/minecraft/platform/Platform.h
@@ -1,6 +1,9 @@
 #pragma once
 
 #include "IPlatformInput.h"
+#include "IPlatformNetwork.h"
 #include "IPlatformProfile.h"
 #include "IPlatformRender.h"
+#include "IPlatformSound.h"
 #include "IPlatformStorage.h"
+#include "IPlatformUIController.h"