diff --git a/examples/five_by_five.css b/examples/five_by_five.css
new file mode 100644
index 0000000000..8901d777af
--- /dev/null
+++ b/examples/five_by_five.css
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+$animation-type: linear;
+$animatin-speed: 175ms;
+
+Game {
+    align: center middle;
+    layers: gameplay messages;
+}
+
+GameGrid {
+    layout: grid;
+    grid-size: 5 5;
+    layer: gameplay;
+}
+
+GameHeader {
+    background: $primary-background;
+    color: $text;
+    height: 1;
+    dock: top;
+    layer: gameplay;
+}
+
+GameHeader #app-title {
+    width: 60%;
+}
+
+GameHeader #moves {
+    width: 20%;
+}
+
+GameHeader #progress {
+    width: 20%;
+}
+
+Footer {
+    height: 1;
+    dock: bottom;
+    layer: gameplay;
+}
+
+GameCell {
+    width: 100%;
+    height: 100%;
+    background: $surface;
+    border: round $surface-darken-1;
+    transition: background $animatin-speed $animation-type, color $animatin-speed $animation-type;
+}
+
+GameCell:hover {
+    background: $panel-lighten-1;
+    border: round $panel;
+}
+
+GameCell.filled {
+    background: $secondary;
+    border: round $secondary-darken-1;
+}
+
+GameCell.filled:hover {
+    background: $secondary-lighten-1;
+    border: round $secondary;
+}
+
+WinnerMessage {
+    width: 50%;
+    height: 25%;
+    layer: messages;
+    visibility: hidden;
+    content-align: center middle;
+    text-align: center;
+    background: $success;
+    color: $text;
+    border: round;
+    padding: 2;
+}
+
+.visible {
+    visibility: visible;
+}
+
+Help {
+    background: $primary;
+    color: $text;
+    border: round $primary-lighten-3;
+    padding: 2;
+}
+
+/* five_by_five.css ends here */
diff --git a/examples/five_by_five.md b/examples/five_by_five.md
new file mode 100644
index 0000000000..6fcc887bba
--- /dev/null
+++ b/examples/five_by_five.md
@@ -0,0 +1,17 @@
+# 5x5
+
+## Introduction
+
+An annoying puzzle for the terminal, built with
+[Textual](https://www.textualize.io/).
+
+## Objective
+
+The object of the game is to fill all of the squares. When you click on a
+square, it, and the squares above, below and to the sides will be toggled.
+
+It is possible to solve the puzzle in as few as 14 moves.
+
+Good luck!
+
+[//]: # (README.md ends here)
diff --git a/examples/five_by_five.py b/examples/five_by_five.py
new file mode 100644
index 0000000000..4c6004aef9
--- /dev/null
+++ b/examples/five_by_five.py
@@ -0,0 +1,330 @@
+"""Simple version of 5x5, developed for/with Textual."""
+
+from pathlib import Path
+from typing import cast
+import sys
+
+if sys.version_info >= (3, 8):
+    from typing import Final
+else:
+    from typing_extensions import Final
+
+from textual.containers import Horizontal
+from textual.app import App, ComposeResult
+from textual.screen import Screen
+from textual.widget import Widget
+from textual.widgets import Footer, Button, Static
+from textual.css.query import DOMQuery
+from textual.reactive import reactive
+from textual.binding import Binding
+
+from rich.markdown import Markdown
+
+
+class Help(Screen):
+    """The help screen for the application."""
+
+    #: Bindings for the help screen.
+    BINDINGS = [("escape,space,q,question_mark", "pop_screen", "Close")]
+
+    def compose(self) -> ComposeResult:
+        """Compose the game's help.
+
+        Returns:
+            ComposeResult: The result of composing the help screen.
+        """
+        yield Static(Markdown(Path(__file__).with_suffix(".md").read_text()))
+
+
+class WinnerMessage(Static):
+    """Widget to tell the user they have won."""
+
+    #: The minimum number of moves you can solve the puzzle in.
+    MIN_MOVES: Final = 14
+
+    @staticmethod
+    def _plural(value: int) -> str:
+        return "" if value == 1 else "s"
+
+    def show(self, moves: int) -> None:
+        """Show the winner message.
+
+        Args:
+            moves (int): The number of moves required to win.
+        """
+        self.update(
+            "W I N N E R !\n\n\n"
+            f"You solved the puzzle in {moves} move{self._plural(moves)}."
+            + (
+                (
+                    f" It is possible to solve the puzzle in {self.MIN_MOVES}, "
+                    f"you were {moves - self.MIN_MOVES} move{self._plural(moves - self.MIN_MOVES)} over."
+                )
+                if moves > self.MIN_MOVES
+                else " Well done! That's the minimum number of moves to solve the puzzle!"
+            )
+        )
+        self.add_class("visible")
+
+    def hide(self) -> None:
+        """Hide the winner message."""
+        self.remove_class("visible")
+
+
+class GameHeader(Widget):
+    """Header for the game.
+
+    Comprises of the title (``#app-title``), the number of moves ``#moves``
+    and the count of how many cells are turned on (``#progress``).
+    """
+
+    #: Keep track of how many moves the player has made.
+    moves = reactive(0)
+
+    #: Keep track of how many cells are filled.
+    filled = reactive(0)
+
+    def compose(self) -> ComposeResult:
+        """Compose the game header.
+
+        Returns:
+            ComposeResult: The result of composing the game header.
+        """
+        yield Horizontal(
+            Static(self.app.title, id="app-title"),
+            Static(id="moves"),
+            Static(id="progress"),
+        )
+
+    def watch_moves(self, moves: int):
+        """Watch the moves reactive and update when it changes.
+
+        Args:
+            moves (int): The number of moves made.
+        """
+        self.query_one("#moves", Static).update(f"Moves: {moves}")
+
+    def watch_filled(self, filled: int):
+        """Watch the on-count reactive and update when it changes.
+
+        Args:
+            filled (int): The number of cells that are currently on.
+        """
+        self.query_one("#progress", Static).update(f"Filled: {filled}")
+
+
+class GameCell(Button):
+    """Individual playable cell in the game."""
+
+    @staticmethod
+    def at(row: int, col: int) -> str:
+        """Get the ID of the cell at the given location.
+
+        Args:
+            row (int): The row of the cell.
+            col (int): The column of the cell.
+
+        Returns:
+            str: A string ID for the cell.
+        """
+        return f"cell-{row}-{col}"
+
+    def __init__(self, row: int, col: int) -> None:
+        """Initialise the game cell.
+
+        Args:
+            row (int): The row of the cell.
+            col (int): The column of the cell.
+
+        """
+        super().__init__("", id=self.at(row, col))
+        self.row = row
+        self.col = col
+
+
+class GameGrid(Widget):
+    """The main playable grid of game cells."""
+
+    def compose(self) -> ComposeResult:
+        """Compose the game grid.
+
+        Returns:
+            ComposeResult: The result of composing the game grid.
+        """
+        for row in range(Game.SIZE):
+            for col in range(Game.SIZE):
+                yield GameCell(row, col)
+
+
+class Game(Screen):
+    """Main 5x5 game grid screen."""
+
+    #: The size of the game grid. Clue's in the name really.
+    SIZE = 5
+
+    #: The bindings for the main game grid.
+    BINDINGS = [
+        Binding("n", "new_game", "New Game"),
+        Binding("question_mark", "push_screen('help')", "Help", key_display="?"),
+        Binding("q", "quit", "Quit"),
+        Binding("up,w,k", "navigate(-1,0)", "Move Up", False),
+        Binding("down,s,j", "navigate(1,0)", "Move Down", False),
+        Binding("left,a,h", "navigate(0,-1)", "Move Left", False),
+        Binding("right,d,l", "navigate(0,1)", "Move Right", False),
+        Binding("space", "move", "Toggle", False),
+    ]
+
+    @property
+    def filled_cells(self) -> DOMQuery[GameCell]:
+        """DOMQuery[GameCell]: The collection of cells that are currently turned on."""
+        return cast(DOMQuery[GameCell], self.query("GameCell.filled"))
+
+    @property
+    def filled_count(self) -> int:
+        """int: The number of cells that are currently filled."""
+        return len(self.filled_cells)
+
+    @property
+    def all_filled(self) -> bool:
+        """bool: Are all the cells filled?"""
+        return self.filled_count == self.SIZE * self.SIZE
+
+    def game_playable(self, playable: bool) -> None:
+        """Mark the game as playable, or not.
+
+        Args:
+            playable (bool): Should the game currently be playable?
+        """
+        for cell in self.query(GameCell):
+            cell.disabled = not playable
+
+    def cell(self, row: int, col: int) -> GameCell:
+        """Get the cell at a given location.
+
+        Args:
+            row (int): The row of the cell to get.
+            col (int): The column of the cell to get.
+
+        Returns:
+            GameCell: The cell at that location.
+        """
+        return self.query_one(f"#{GameCell.at(row,col)}", GameCell)
+
+    def compose(self) -> ComposeResult:
+        """Compose the game screen.
+
+        Returns:
+            ComposeResult: The result of composing the game screen.
+        """
+        yield GameHeader()
+        yield GameGrid()
+        yield Footer()
+        yield WinnerMessage()
+
+    def toggle_cell(self, row: int, col: int) -> None:
+        """Toggle an individual cell, but only if it's in bounds.
+
+        If the row and column would place the cell out of bounds for the
+        game grid, this function call is a no-op. That is, it's safe to call
+        it with an invalid cell coordinate.
+
+        Args:
+            row (int): The row of the cell to toggle.
+            col (int): The column of the cell to toggle.
+        """
+        if 0 <= row <= (self.SIZE - 1) and 0 <= col <= (self.SIZE - 1):
+            self.cell(row, col).toggle_class("filled")
+
+    _PATTERN: Final = (-1, 1, 0, 0, 0)
+
+    def toggle_cells(self, cell: GameCell) -> None:
+        """Toggle a 5x5 pattern around the given cell.
+
+        Args:
+            cell (GameCell): The cell to toggle the cells around.
+        """
+        for row, col in zip(self._PATTERN, reversed(self._PATTERN)):
+            self.toggle_cell(cell.row + row, cell.col + col)
+        self.query_one(GameHeader).filled = self.filled_count
+
+    def make_move_on(self, cell: GameCell) -> None:
+        """Make a move on the given cell.
+
+        All relevant cells around the given cell are toggled as per the
+        game's rules.
+
+        Args:
+            cell (GameCell): The cell to make a move on
+        """
+        self.toggle_cells(cell)
+        self.query_one(GameHeader).moves += 1
+        if self.all_filled:
+            self.query_one(WinnerMessage).show(self.query_one(GameHeader).moves)
+            self.game_playable(False)
+
+    def on_button_pressed(self, event: GameCell.Pressed) -> None:
+        """React to a press of a button on the game grid.
+
+        Args:
+            event (GameCell.Pressed): The event to react to.
+        """
+        self.make_move_on(cast(GameCell, event.button))
+
+    def action_new_game(self) -> None:
+        """Start a new game."""
+        self.query_one(GameHeader).moves = 0
+        self.filled_cells.remove_class("filled")
+        self.query_one(WinnerMessage).hide()
+        middle = self.cell(self.SIZE // 2, self.SIZE // 2)
+        self.toggle_cells(middle)
+        self.set_focus(middle)
+        self.game_playable(True)
+
+    def action_navigate(self, row: int, col: int) -> None:
+        """Navigate to a new cell by the given offsets.
+
+        Args:
+            row (int): The row of the cell to navigate to.
+            col (int): The column of the cell to navigate to.
+        """
+        if isinstance(self.focused, GameCell):
+            self.set_focus(
+                self.cell(
+                    (self.focused.row + row) % self.SIZE,
+                    (self.focused.col + col) % self.SIZE,
+                )
+            )
+
+    def action_move(self) -> None:
+        """Make a move on the current cell."""
+        if isinstance(self.focused, GameCell):
+            self.focused.press()
+
+    def on_mount(self) -> None:
+        """Get the game started when we first mount."""
+        self.action_new_game()
+
+
+class FiveByFive(App[None]):
+    """Main 5x5 application class."""
+
+    #: The name of the stylesheet for the app.
+    CSS_PATH = "five_by_five.css"
+
+    #: The pre-loaded screens for the application.
+    SCREENS = {"help": Help()}
+
+    #: App-level bindings.
+    BINDINGS = [("D", "toggle_dark", "Toggle Dark Mode")]
+
+    def __init__(self) -> None:
+        """Constructor."""
+        super().__init__(title="5x5 -- A little annoying puzzle")
+
+    def on_mount(self) -> None:
+        """Set up the application on startup."""
+        self.push_screen(Game())
+
+
+if __name__ == "__main__":
+    FiveByFive().run()