diff --git a/configs.js b/configs.js
index 49582a9..317becf 100644
--- a/configs.js
+++ b/configs.js
@@ -3,7 +3,7 @@ const configs = (function () {
 
 	// settings
 	const enableLimit = true; // true or false
-	const limit = 5; // integer
+	const limit = 10; // integer
 
 	// animation
 	const scrollSpeed = 30; // milliseconds (DO NOT PUT BELOW 5, COMPUTER MIGHT CRASH) the lower the value, the faster the scroll
@@ -126,6 +126,20 @@ const configs = (function () {
 		"!finished",
 	];
 
+	// Unfinish task commands - please add commands in the exact format
+	const unfinishTaskCommands = [
+		"!tasku",
+		"!taskunfinish",
+		"!utask",
+		"!unfinishtask",
+		"!taskud",
+		"!taskundone",
+		"!undonetask",
+		"!undone",
+		"!unfinish",
+		"!unfinished",
+	];
+
 	// Check task commands - please add commands in the exact format
 	const checkCommands = [
 		"!taskc",
@@ -187,7 +201,8 @@ const configs = (function () {
 	const noTaskAdded =
 		"Looks like you already hit the limit of incomplete tasks, {user}";
 	const noTaskContent = "Try using !task the-task-you-are-working-on {user}";
-	const taskDeleted = 'Task "{task}" has been deleted successfully, {user}';
+	const taskDeleted =
+		'Task(s) "{task}" has been deleted successfully, {user}';
 	const specifyTaskIndex = "Try specifying the index of the task {user}";
 
 	const duplicateTask =
@@ -198,6 +213,8 @@ const configs = (function () {
 
 	const adminDeleteTasks = "All of {mentioned}'s tasks have been deleted";
 	const taskFinished = 'Good job on finishing the task "{task}", {user}!';
+	const taskUnfinished =
+		'Task(s) "{task}" has been unmarked as done, {user}!';
 	const taskEdited =
 		"Task '{originalTask}' has been edited to '{task}' successfully, {user}";
 	const noTaskEdit = "Try doing !edit [index] [new task] {user}";
@@ -290,6 +307,7 @@ const configs = (function () {
 		editTaskCommands,
 		deleteTaskCommands,
 		finishTaskCommands,
+		unfinishTaskCommands,
 		helpCommands,
 		checkCommands,
 		clearMyDoneCommands,
@@ -308,6 +326,7 @@ const configs = (function () {
 		specifyTaskIndex,
 		duplicateTask,
 		taskFinished,
+		taskUnfinished,
 		taskEdited,
 		noTaskEdit,
 		noTask,
diff --git a/scripts/index.js b/scripts/index.js
index 6c9dd3d..dcde33e 100644
--- a/scripts/index.js
+++ b/scripts/index.js
@@ -107,6 +107,27 @@ ComfyJS.onCommand = (user, command, message, flags, extra) => {
 
 			respond(finishedResponse, params);
 		}
+	} else if (commands.unfinishTaskCommands.includes(command)) {
+		let unfinishStatus = markTaskUndone(user, message);
+
+		if (unfinishStatus === 0) {
+			// user has no tasks
+			respond(responses.noTask, params);
+		} else if (unfinishStatus === 1) {
+			// invalid input
+			respond(responses.specifyTaskIndex, params);
+		} else {
+			// task unfinished
+			let unfinishedResponse = responses.taskUnfinished;
+
+			params.task = unfinishStatus.markedTasks;
+
+			if (unfinishStatus.failedTasks !== "") {
+				unfinishedResponse += ` | Failed to unfinish task(s): "${unfinishStatus.failedTasks}"`;
+			}
+
+			respond(unfinishedResponse, params);
+		}
 	} else if (commands.checkCommands.includes(command)) {
 		if (message === "") {
 			let response = checkTasks(user);
diff --git a/scripts/taskList.js b/scripts/taskList.js
index 6d6efa2..b09e7d5 100644
--- a/scripts/taskList.js
+++ b/scripts/taskList.js
@@ -264,7 +264,7 @@ function removeTask(username, task) {
 			if (index === -1) {
 				if (isInt(t)) {
 					index = parseInt(t) - 1; // ACTUAL INDEX
-				} else if (incompleteTasks.length) {
+				} else if (incompleteTasks.length === 1) {
 					index = tasks[username].todos.findIndex((t) => !t.done);
 					tasksRemoved.push(tasks[username].todos[index].text);
 					removedTaskIndex.push(index);
@@ -314,7 +314,7 @@ function removeTask(username, task) {
 		if (index === -1) {
 			if (isInt(task)) {
 				index = parseInt(task) - 1; // ACTUAL INDEX
-			} else if (incompleteTasks.length) {
+			} else if (incompleteTasks.length === 1) {
 				index = tasks[username].todos.findIndex((t) => !t.done);
 			} else {
 				return 1;
@@ -403,7 +403,7 @@ function markTaskDone(username, task) {
 			if (index === -1) {
 				if (isInt(t)) {
 					index = parseInt(t) - 1; // ACTUAL INDEX
-				} else if (incompleteTasks.length) {
+				} else if (incompleteTasks.length === 1) {
 					index = tasks[username].todos.findIndex((t) => !t.done);
 					tasksMarkedComplete.push(tasks[username].todos[index].text);
 				} else {
@@ -443,7 +443,7 @@ function markTaskDone(username, task) {
 		if (index === -1) {
 			if (isInt(task)) {
 				index = parseInt(task) - 1; // ACTUAL INDEX
-			} else if (incompleteTasks.length) {
+			} else if (incompleteTasks.length === 1) {
 				index = tasks[username].todos.findIndex((t) => !t.done);
 			} else {
 				return 1;
@@ -465,6 +465,98 @@ function markTaskDone(username, task) {
 	}
 }
 
+function markTaskUndone(username, task) {
+	const tasks = JSON.parse(localStorage.tasks);
+
+	// user does not have any tasks
+	if (!tasks[username] || tasks[username].todos.length === 0) {
+		return 0;
+	}
+
+	const completedTasks = tasks[username].todos.filter((t) => t.done);
+
+	// match regex: integers separated by space e.g. '1 2 3 4'
+	if (task.match(/^(\d+ )*\d+$/)) {
+		// insert commas between integers
+		task = task.replace(/(\d+)/g, "$1,");
+		// remove trailing comma
+		task = task.slice(0, -1);
+	}
+
+	let tasksMarkedUndone = [];
+	let tasksFailedToMarkUndone = [];
+
+	// check if there's a comma in the task (multiple tasks)
+	if (task.includes(",")) {
+		let tasksToMarkUndone = task.split(",").map((t) => t.trim());
+		for (const t of tasksToMarkUndone) {
+			let index = tasks[username].todos.findIndex(
+				(task) => task.text.toLowerCase() === t.toLowerCase()
+			);
+
+			if (index === -1) {
+				// user input isn't the task name
+				if (isInt(t)) {
+					index = parseInt(t) - 1; // ACTUAL INDEX
+				} else {
+					tasksFailedToMarkUndone.push(t);
+					continue;
+				}
+
+				if (index < 0 || index > tasks[username].todos.length - 1) {
+					tasksFailedToMarkUndone.push(t);
+					continue;
+				} else {
+					tasksMarkedUndone.push(tasks[username].todos[index].text);
+				}
+			} else {
+				tasksMarkedUndone.push(tasks[username].todos[index].text);
+			}
+			tasks[username].todos[index].done = false;
+		}
+
+		if (tasksMarkedUndone.length === 0) {
+			return 1;
+		}
+
+		localStorage.setItem(`tasks`, JSON.stringify(tasks));
+		if (!scrolling) {
+			renderTaskListToDOM();
+		}
+
+		return {
+			markedTasks: tasksMarkedUndone.join('", "'),
+			failedTasks: tasksFailedToMarkUndone.join('", "'),
+		};
+	} else {
+		let index = tasks[username].todos.findIndex(
+			(t) => t.text.toLowerCase() === task.toLowerCase()
+		);
+
+		if (index === -1) {
+			if (isInt(task)) {
+				index = parseInt(task) - 1; // ACTUAL INDEX
+			} else if (completedTasks.length === 1) {
+				index = tasks[username].todos.findIndex((t) => t.done);
+			} else {
+				return 1;
+			}
+
+			if (index < 0 || index > tasks[username].todos.length - 1) {
+				return 1;
+			}
+
+			tasks[username].todos[index].done = false;
+			localStorage.setItem(`tasks`, JSON.stringify(tasks));
+			renderTaskListToDOM();
+			return {
+				markedTasks: tasks[username].todos[index].text,
+				failedTasks: "",
+			};
+		}
+	}
+}
+
 // 0: user has no tasks
 // 1: invalid input
 // [original task, new task]: succcess