diff --git a/config/AcediaSystem.ini b/config/AcediaSystem.ini
index ac5dbc6..5bfd2d6 100644
--- a/config/AcediaSystem.ini
+++ b/config/AcediaSystem.ini
@@ -140,6 +140,10 @@ requiredGroup=""
 maxVisibleLineWidth=80
 maxTotalLineWidth=108
 
+[AcediaCore.PlayerNotificationQueue]
+; Maximum time that a notification is allowed to be displayed on the player's screen
+maximumNotifyTime=20
+
 [AcediaCore.ColorAPI]
 ;   Changing these values will alter color's definitions in `ColorAPI`,
 ; changing how Acedia behaves
diff --git a/sources/LevelAPI/API/Time/Timer.uc b/sources/LevelAPI/API/Time/Timer.uc
index f9dd79e..136f249 100644
--- a/sources/LevelAPI/API/Time/Timer.uc
+++ b/sources/LevelAPI/API/Time/Timer.uc
@@ -78,6 +78,7 @@ public function float GetInterval();
  *
  *  Setting this value while the caller `Timer` is running resets it (same as
  *  calling `StopMe().Start()`).
+ *  But the already inactive timer won't start anew.
  *
  *  @param  newInterval How many seconds should separate two `OnElapsed()` 
  *      signals (or starting a timer and next `OnElapsed()` event)?
diff --git a/sources/LevelAPI/Features/Commands/BuiltInCommands/ACommandNotify.uc b/sources/LevelAPI/Features/Commands/BuiltInCommands/ACommandNotify.uc
new file mode 100644
index 0000000..d992449
--- /dev/null
+++ b/sources/LevelAPI/Features/Commands/BuiltInCommands/ACommandNotify.uc
@@ -0,0 +1,53 @@
+/**
+ * Author: dkanus
+ * Home repo: https://www.insultplayers.ru/git/AcediaFramework/AcediaCore
+ * License: GPL
+ * Copyright 2023 Anton Tarasenko
+ *------------------------------------------------------------------------------
+ * This file is part of Acedia.
+ *
+ * Acedia is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Acedia is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Acedia.  If not, see <https://www.gnu.org/licenses/>.
+ */
+class ACommandNotify extends Command;
+
+protected function BuildData(CommandDataBuilder builder) {
+    builder.Name(P("notify"));
+    builder.Group(P("core"));
+    builder.Summary(P("Notifies players with provided message."));
+    builder.ParamText(P("message"));
+    builder.OptionalParams();
+    builder.ParamNumber(P("duration"));
+    builder.Describe(P("Notify to players message with distinct header and body."));
+    builder.RequireTarget();
+
+    builder.Option(P("title"));
+    builder.Describe(P("Specify the optional title of the notification."));
+    builder.ParamText(P("title"));
+}
+
+protected function ExecutedFor(EPlayer target, CallData arguments, EPlayer instigator) {
+    local Text title, message, plainTitle, plainMessage;
+
+    plainMessage = arguments.parameters.GetText(P("message"));
+    if (arguments.options.HasKey(P("title"))) {
+        plainTitle = arguments.options.GetTextBy(P("/title/title"));
+    }
+    title = _.text.FromFormatted(plainTitle);
+    message = _.text.FromFormatted(plainMessage);
+    target.Notify(title, message, arguments.parameters.GetFloat(P("duration")));
+    _.memory.Free4(title, message, plainTitle, plainMessage);
+}
+
+defaultproperties {
+}
\ No newline at end of file
diff --git a/sources/LevelAPI/Features/Commands/Commands_Feature.uc b/sources/LevelAPI/Features/Commands/Commands_Feature.uc
index 5e9166e..2f9008c 100644
--- a/sources/LevelAPI/Features/Commands/Commands_Feature.uc
+++ b/sources/LevelAPI/Features/Commands/Commands_Feature.uc
@@ -109,6 +109,7 @@ protected function OnEnabled()
     registeredCommands  = _.collections.EmptyHashTable();
     groupedCommands     = _.collections.EmptyHashTable();
     RegisterCommand(class'ACommandHelp');
+    RegisterCommand(class'ACommandNotify');
     //  Macro selector
     commandDelimiters[0] = _.text.FromString("@");
     //  Key selector
diff --git a/sources/Players/EPlayer.uc b/sources/Players/EPlayer.uc
index 40dabce..1dc7fef 100644
--- a/sources/Players/EPlayer.uc
+++ b/sources/Players/EPlayer.uc
@@ -53,6 +53,8 @@ struct PlayerSignals
 //  `PlayersAPI` and is expected to be allocated during the whole Acedia run.
 var protected PlayerSignals signalsReferences;
 
+var private LoggerAPI.Definition errNoIdentity;
+
 protected function Finalizer()
 {
     _.memory.Free(controller);
@@ -502,7 +504,31 @@ public final function /* borrow */ ConsoleWriter BorrowConsole()
     return consoleInstance.ForPlayer(self);
 }
 
-defaultproperties
-{
+/// Notifies player about something with a text message.
+///
+/// Header is allowed to be `none`, but it is recommended to set it to an actual value.
+/// Duration is more of a suggestion and might be clamped to some reasonable value that depends on
+/// implementation/server settings.
+public final function Notify(BaseText header, BaseText body, optional float duration) {
+    local HashTable sessionData;
+    local PlayerNotificationQueue messageQueue;
+
+    if (identity == none) {
+        _.logger.Auto(errNoIdentity);
+        return;
+    }
+    sessionData = identity.GetSessionData(P("Acedia"));
+    messageQueue = PlayerNotificationQueue(sessionData.GetItem(P("MessageQueue")));
+    if (messageQueue == none) {
+        messageQueue = PlayerNotificationQueue(_.memory.Allocate(class'PlayerNotificationQueue'));
+        sessionData.SetItem(P("MessageQueue"), messageQueue);
+    }
+    messageQueue.SetupController(controller);
+    messageQueue.AddNotification(header, body, duration);
+    _.memory.Free2(sessionData, messageQueue);
+}
+
+defaultproperties {
     usesObjectPool = false
+    errNoIdentity = (l=LOG_Warning,m="`EPlayer` without `identity` is being used. It is likely not initialized and something is working incorrectly.")
 }
\ No newline at end of file
diff --git a/sources/Players/PlayerNotificationQueue.uc b/sources/Players/PlayerNotificationQueue.uc
new file mode 100644
index 0000000..968d619
--- /dev/null
+++ b/sources/Players/PlayerNotificationQueue.uc
@@ -0,0 +1,219 @@
+/**
+ * Author: dkanus
+ * Home repo: https://www.insultplayers.ru/git/AcediaFramework/AcediaCore
+ * License: GPL
+ * Copyright 2023 Anton Tarasenko
+ *------------------------------------------------------------------------------
+ * This file is part of Acedia.
+ *
+ * Acedia is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Acedia is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Acedia.  If not, see <https://www.gnu.org/licenses/>.
+ */
+class PlayerNotificationQueue extends AcediaObject
+    config(AcediaSystem);
+
+/// Manages queue of notifications that should be displayed for a certain player.
+
+/// Describes a single notification: title (optional, can be `none`) + message body and timeout
+struct Notification {
+    var Text title;
+    var Text body;
+    var float time;
+};
+var private array<Notification> notificationQueue;
+/// Reference to the `PlayerController` for the player that owns this queue
+var private NativeActorRef playerControllerRef;
+/// Timer until next notification can be displayed
+///
+/// `none` if queue currently doesn't display any notifications
+var private Timer nextNotificationTimer;
+
+/// Maximum time that a notification is allowed to be displayed on the player's screen
+var private const config float maximumNotifyTime;
+
+var private const int CODEPOINT_NEWLINE;
+
+protected function Finalizer() {
+    local int i;
+
+    for (i = 0; i < notificationQueue.length; i += 1) {
+        _.memory.Free(notificationQueue[i].title);
+        _.memory.Free(notificationQueue[i].body);
+    }
+    notificationQueue.length = 0;
+    _.memory.Free(nextNotificationTimer);
+    _.memory.Free(playerControllerRef);
+    nextNotificationTimer = none;
+    playerControllerRef = none;
+}
+
+/// Set owner `PlayerController` for this queue
+public final /*native*/ function SetupController(NativeActorRef newPlayerControllerRef) {
+    local PlayerController oldController, newController;
+
+    if (playerControllerRef != none) {
+        oldController = PlayerController(playerControllerRef.Get());
+    }
+    if (newPlayerControllerRef != none) {
+        newController = PlayerController(newPlayerControllerRef.Get());
+    }
+    if (oldController != newController) {
+        InterruptScheduling();
+        _.memory.Free(playerControllerRef);
+        if (newPlayerControllerRef != none) {
+            newPlayerControllerRef.NewRef();
+            playerControllerRef = newPlayerControllerRef;
+            SetupNextNotification(none);
+        } else {
+            playerControllerRef = none;
+        }
+    }
+}
+
+/// Add new notification to the queue
+public final function AddNotification(BaseText title, BaseText body, float time) {
+    local Notification newNotification;
+
+    if (body == none) {
+        return;
+    }
+    if (title != none) {
+        newNotification.title = title.Copy();
+    }
+    newNotification.body = body.Copy();
+    notificationQueue[notificationQueue.length] = newNotification;
+    if (!IsUpdateScheduled()) {
+        SetupNextNotification(none);
+    }
+}
+
+// Sets up [`SetupNextNotification()`] to be called after [`timeUntilNextUpdate`]
+private function ScheduleUpdate(float timeUntilNextUpdate) {
+    if (nextNotificationTimer == none) {
+        nextNotificationTimer = __level().time.StartRealTimer(timeUntilNextUpdate, false);
+        nextNotificationTimer.OnElapsed(nextNotificationTimer).connect = SetupNextNotification;
+    } else {
+        nextNotificationTimer.SetInterval(timeUntilNextUpdate);
+        nextNotificationTimer.Start();
+    }
+}
+
+private function bool IsUpdateScheduled() {
+    return (nextNotificationTimer != none);
+}
+
+// Prevents scheduled [`SetupNextNotification()`] call from going off
+private function InterruptScheduling() {
+    _.memory.Free(nextNotificationTimer);
+    nextNotificationTimer = none;
+}
+
+// Properly translates [`contents`] into a colored [`string`] before setting it up as
+// a [`PlayerController`]'s progress message at the given line index.
+private function SetupProgressLine(
+    int lineIndex,
+    BaseText contents,
+    PlayerController playerController
+) {
+    local string contentsAsString;
+    local BaseText.Formatting startingFormatting;
+
+    if (contents == none)           return;
+    if (playerController == none)   return;
+
+    // Drop first colored tag, since we'll set first color through `playerController.progressColor`
+    contentsAsString = Mid(contents.ToColoredString(,, _.color.white), 4);
+    startingFormatting = contents.GetFormatting(0);
+    if (startingFormatting.isColored) {
+        playerController.SetProgressMessage(lineIndex, contentsAsString, startingFormatting.color);
+    }
+    else {
+        playerController.SetProgressMessage(lineIndex, contentsAsString, _.color.white);
+    }
+}
+
+// Prints [`notification`] on given lines, respecting line breaks inside it as much as possible
+// (creates up to [`maxLines`], replacing the rest of line breaks with whitespaces)
+private function PrintNotifcationAt(
+    PlayerController playerController,
+    BaseText notification,
+    int startingLine,
+    int maxLines
+) {
+    local int i, j;
+    local MutableText lastLine;
+    local array<BaseText> lines;
+
+    if (notification == none)   return;
+    if (startingLine < 0)       return;
+    if (startingLine > 3)       return;
+
+    lines = notification.SplitByCharacter(_.text.CharacterFromCodePoint(CODEPOINT_NEWLINE),, true);
+    for (i = 0; i < lines.length; i += 1) {
+        if (i + 1 < maxLines) {
+            SetupProgressLine(i + startingLine, lines[i], playerController);
+        } else {
+            lastLine = lines[i].MutableCopy();
+            for (j = i + 1; j < lines.length; j += 1) {
+                lastLine.Append(P(" "));
+                lastLine.Append(lines[j]);
+            }
+            SetupProgressLine(startingLine + maxLines - 1, lastLine, playerController);
+            _.memory.Free(lastLine);
+            break;
+        }
+    }
+}
+
+private function SetupNextNotification(Timer callerInstance) {
+    local int titleShift;
+    local MutableText upperCaseTitle;
+    local Notification nextNotification;
+    local PlayerController playerController;
+
+    // Get appropriate [`PlayerController`] and next notification
+    playerController = PlayerController(playerControllerRef.Get());
+    if (playerController == none) {
+        _.memory.Free(playerControllerRef);
+        playerControllerRef = none;
+    }
+    if (notificationQueue.length <= 0 || playerController == none) {
+        InterruptScheduling();
+        return;
+    }
+    nextNotification = notificationQueue[0];
+    notificationQueue.Remove(0, 1);
+    nextNotification.time = FMin(nextNotification.time, maximumNotifyTime);
+    if (nextNotification.time <= 0) {
+        nextNotification.time = 10.0;
+    }
+
+    // And print
+    playerController.ClearProgressMessages();
+    playerController.SetProgressTime(nextNotification.time);
+    if (nextNotification.title != none) {
+        upperCaseTitle = nextNotification.title.UpperMutableCopy();
+        upperCaseTitle.ChangeDefaultColor(_.color.TextHeader);
+        PrintNotifcationAt(playerController, upperCaseTitle, 0, 1);
+        titleShift = 1;
+        _.memory.Free(upperCaseTitle);
+    }
+    PrintNotifcationAt(playerController, nextNotification.body, titleShift, 4 - titleShift);
+    ScheduleUpdate(nextNotification.time);
+    _.memory.Free2(nextNotification.title, nextNotification.body);
+}
+
+defaultproperties {
+    CODEPOINT_NEWLINE = 10
+    maximumNotifyTime = 20.0
+}
\ No newline at end of file
diff --git a/sources/Users/User.uc b/sources/Users/User.uc
index 246a825..4eae0ad 100644
--- a/sources/Users/User.uc
+++ b/sources/Users/User.uc
@@ -103,6 +103,25 @@ public final function int GetKey()
     return key;
 }
 
+/**
+ * Returns a reference to user's session data for a given group.
+ *
+ * Guaranteed to not be `none`.
+ */
+public final function HashTable GetSessionData(Text groupName)
+{
+    local HashTable groupData;
+    if (sessionData == none) {
+        sessionData = _.collections.EmptyHashTable();
+    }
+    groupData = sessionData.GetHashTable(groupName);
+    if (groupData == none) {
+        groupData = _.collections.EmptyHashTable();
+        sessionData.SetItem(groupName, groupData);
+    }
+    return groupData;
+}
+
 /**
  *  Returns persistent data for the caller user. Data is specified by the its
  *  name along with the name of the data group it is stored in.