diff --git a/osu.Game/Online/Multiplayer/MatchServerEvent.cs b/osu.Game/Online/Multiplayer/MatchServerEvent.cs
index 402de392a84c..723452d3f63b 100644
--- a/osu.Game/Online/Multiplayer/MatchServerEvent.cs
+++ b/osu.Game/Online/Multiplayer/MatchServerEvent.cs
@@ -19,6 +19,7 @@ namespace osu.Game.Online.Multiplayer
     [Union(1, typeof(CountdownStoppedEvent))]
     [Union(2, typeof(MatchmakingAvatarActionEvent))]
     [Union(3, typeof(RankedPlayCardHandReplayEvent))]
+    [Union(4, typeof(RollEvent))]
     public abstract class MatchServerEvent
     {
     }
diff --git a/osu.Game/Online/Multiplayer/MatchTypes/TeamVersus/TeamVersusRoomState.cs b/osu.Game/Online/Multiplayer/MatchTypes/TeamVersus/TeamVersusRoomState.cs
index 375842964395..d5e30bb2e08b 100644
--- a/osu.Game/Online/Multiplayer/MatchTypes/TeamVersus/TeamVersusRoomState.cs
+++ b/osu.Game/Online/Multiplayer/MatchTypes/TeamVersus/TeamVersusRoomState.cs
@@ -12,6 +12,9 @@ public class TeamVersusRoomState : MatchRoomState
         [Key(0)]
         public List<MultiplayerTeam> Teams { get; set; } = new List<MultiplayerTeam>();
 
+        [Key(1)]
+        public bool Locked { get; set; }
+
         public static TeamVersusRoomState CreateDefault() =>
             new TeamVersusRoomState
             {
diff --git a/osu.Game/Online/Multiplayer/MatchUserRequest.cs b/osu.Game/Online/Multiplayer/MatchUserRequest.cs
index fdcbf756822f..bacc1a7632b4 100644
--- a/osu.Game/Online/Multiplayer/MatchUserRequest.cs
+++ b/osu.Game/Online/Multiplayer/MatchUserRequest.cs
@@ -21,6 +21,8 @@ namespace osu.Game.Online.Multiplayer
     [Union(2, typeof(StopCountdownRequest))]
     [Union(3, typeof(MatchmakingAvatarActionRequest))]
     [Union(4, typeof(RankedPlayCardHandReplayRequest))]
+    [Union(5, typeof(SetLockStateRequest))]
+    [Union(6, typeof(RollRequest))]
     public abstract class MatchUserRequest
     {
     }
diff --git a/osu.Game/Online/Multiplayer/RollEvent.cs b/osu.Game/Online/Multiplayer/RollEvent.cs
new file mode 100644
index 000000000000..8588bc6adf1a
--- /dev/null
+++ b/osu.Game/Online/Multiplayer/RollEvent.cs
@@ -0,0 +1,36 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+using MessagePack;
+
+namespace osu.Game.Online.Multiplayer
+{
+    /// <summary>
+    /// Communicates the result of a <see cref="RollRequest"/>.
+    /// </summary>
+    [Serializable]
+    [MessagePackObject]
+    public class RollEvent : MatchServerEvent
+    {
+        /// <summary>
+        /// The ID of the user who initiated the roll.
+        /// </summary>
+        [Key(0)]
+        public int UserID { get; set; }
+
+        /// <summary>
+        /// Determines the maximum possible result of the roll.
+        /// Bigger than 1.
+        /// </summary>
+        [Key(1)]
+        public uint Max { get; set; }
+
+        /// <summary>
+        /// The actual result of the roll.
+        /// In the range [1, <see cref="Max"/>], inclusive both ends.
+        /// </summary>
+        [Key(2)]
+        public uint Result { get; set; }
+    }
+}
diff --git a/osu.Game/Online/Multiplayer/RollRequest.cs b/osu.Game/Online/Multiplayer/RollRequest.cs
new file mode 100644
index 000000000000..3f6be23e1e87
--- /dev/null
+++ b/osu.Game/Online/Multiplayer/RollRequest.cs
@@ -0,0 +1,24 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+using MessagePack;
+
+namespace osu.Game.Online.Multiplayer
+{
+    /// <summary>
+    /// Requests a random roll of a number from 1 to <see cref="Max"/> inclusive.
+    /// </summary>
+    [Serializable]
+    [MessagePackObject]
+    public class RollRequest : MatchUserRequest
+    {
+        /// <summary>
+        /// Determines the maximum possible result of the roll.
+        /// Must be bigger than 1.
+        /// Defaults to 100 if not provided.
+        /// </summary>
+        [Key(0)]
+        public uint? Max { get; set; }
+    }
+}
diff --git a/osu.Game/Online/Multiplayer/SetLockStateRequest.cs b/osu.Game/Online/Multiplayer/SetLockStateRequest.cs
new file mode 100644
index 000000000000..8f1451fdab7a
--- /dev/null
+++ b/osu.Game/Online/Multiplayer/SetLockStateRequest.cs
@@ -0,0 +1,24 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using MessagePack;
+
+namespace osu.Game.Online.Multiplayer
+{
+    [MessagePackObject]
+    public class SetLockStateRequest : MatchUserRequest
+    {
+        /// <summary>
+        /// <para>
+        /// If <see langword="true"/>, <see cref="MultiplayerRoomUserRole.Player"/>s will not be able to change teams by themselves in the room,
+        /// only <see cref="MultiplayerRoomUserRole.Referee"/>s will be able to change teams for the <see cref="MultiplayerRoomUserRole.Player"/>s.
+        /// </para>
+        /// <para>
+        /// If <see langword="false"/>, any user can change their team in the room.
+        /// </para>
+        /// </summary>
+        // TODO: mention slots as well when slots are reimplemented
+        [Key(0)]
+        public bool Locked { get; set; }
+    }
+}
diff --git a/osu.Game/Online/SignalRWorkaroundTypes.cs b/osu.Game/Online/SignalRWorkaroundTypes.cs
index 70c6fcf2b780..06e8451205b2 100644
--- a/osu.Game/Online/SignalRWorkaroundTypes.cs
+++ b/osu.Game/Online/SignalRWorkaroundTypes.cs
@@ -27,8 +27,11 @@ internal static class SignalRWorkaroundTypes
             (typeof(ChangeTeamRequest), typeof(MatchUserRequest)),
             (typeof(StartMatchCountdownRequest), typeof(MatchUserRequest)),
             (typeof(StopCountdownRequest), typeof(MatchUserRequest)),
+            (typeof(SetLockStateRequest), typeof(MatchUserRequest)),
+            (typeof(RollRequest), typeof(MatchUserRequest)),
             (typeof(CountdownStartedEvent), typeof(MatchServerEvent)),
             (typeof(CountdownStoppedEvent), typeof(MatchServerEvent)),
+            (typeof(RollEvent), typeof(MatchServerEvent)),
             (typeof(TeamVersusRoomState), typeof(MatchRoomState)),
             (typeof(TeamVersusUserState), typeof(MatchUserState)),
             (typeof(MatchStartCountdown), typeof(MultiplayerCountdown)),