diff --git a/lihzahrd/errors.py b/lihzahrd/errors.py
new file mode 100644
index 0000000..16be521
--- /dev/null
+++ b/lihzahrd/errors.py
@@ -0,0 +1,2 @@
+class InvalidFooterError(Exception):
+    """This exception is raised if the footer contents do not match the expected data."""
diff --git a/lihzahrd/tiles/__init__.py b/lihzahrd/tiles/__init__.py
index 6d6484a..2ca8f29 100644
--- a/lihzahrd/tiles/__init__.py
+++ b/lihzahrd/tiles/__init__.py
@@ -9,6 +9,7 @@ from .block import Block
 from .wall import Wall
 from .liquid import Liquid
 from .tile import Tile
+from .tilematrix import TileMatrix
 
 __all__ = ["LiquidType", "RLEEncoding", "Shape", "Wiring", "BlockType", "FrameImportantData", "WallType", "Block",
-           "Wall", "Liquid", "Tile"]
+           "Wall", "Liquid", "Tile", "TileMatrix"]
diff --git a/lihzahrd/tiles/tilematrix.py b/lihzahrd/tiles/tilematrix.py
new file mode 100644
index 0000000..4493949
--- /dev/null
+++ b/lihzahrd/tiles/tilematrix.py
@@ -0,0 +1,61 @@
+import typing
+from .tile import Tile
+from ..fileutils import FileReader, Coordinates
+
+
+class TileMatrix:
+    """A huge matrix containing the tiles of a whole world."""
+
+    def __init__(self):
+        self._tiles: typing.List[typing.List[Tile]] = []
+
+    def __repr__(self):
+        if len(self._tiles) > 0:
+            return f"<TileMatrix {len(self._tiles)}x{len(self._tiles[0])}>"
+        return f"<TileMatrix 0x0>"
+
+    def __getitem__(self, item: typing.Union[typing.Tuple, Coordinates]):
+        """Get a tile at specific coordinates.
+
+        (x=0, y=0) returns the top-left tile in the map.
+
+        You can specify a negative coordinate to count tiles respectively from the right or from the bottom:
+        (x=-1, y=-1) returns the bottom-right tile in the map."""
+        if isinstance(item, Coordinates):
+            return self._tiles[item.x][item.y]
+        elif isinstance(item, tuple):
+            return self._tiles[item[0]][item[1]]
+        else:
+            raise TypeError(f"Unsupported type: {item.__class__.__name__}")
+
+    def __setitem__(self, key: typing.Union[typing.Tuple, Coordinates], value: Tile):
+        """Change a tile at specific coordinates.
+
+        The same properties that apply to __getitem__ are valid for __setitem__."""
+        if not isinstance(value, Tile):
+            raise TypeError(f"Invalid type: {value.__class__.__name__} instead of Tile")
+        if isinstance(key, Coordinates):
+            self._tiles[key.x][key.y] = value
+        elif isinstance(key, tuple):
+            self._tiles[key[0]][key[1]] = value
+        else:
+            raise TypeError(f"Invalid type: {key.__class__.__name__} instead of tuple or Coordinates")
+
+    def __len__(self):
+        """Return the amount of tiles present in the matrix."""
+        if len(self._tiles) > 0:
+            return len(self._tiles) * len(self._tiles[0])
+        return 0
+
+    def add_column(self, column: typing.List[Tile]):
+        """Add a new column to the matrix."""
+        if len(self._tiles) > 0 and len(column) != len(self._tiles[0]):
+            raise ValueError("column has a different length than the others in the matrix")
+        self._tiles.append(column)
+
+    @property
+    def size(self) -> Coordinates:
+        """Return the size of the matrix as a pair of coordinates."""
+        if len(self._tiles) > 0:
+            return Coordinates(len(self._tiles), len(self._tiles[0]))
+        return Coordinates(0, 0)
diff --git a/lihzahrd/tiles/wiring.py b/lihzahrd/tiles/wiring.py
index feb338b..950c30d 100644
--- a/lihzahrd/tiles/wiring.py
+++ b/lihzahrd/tiles/wiring.py
@@ -37,4 +37,4 @@ class Wiring:
             if flags3 is not None:
                 return cls(red=flags2[1], green=flags2[2], blue=flags2[3], yellow=flags3[5], actuator=flags3[1])
             return cls(red=flags2[1], green=flags2[2], blue=flags2[3])
-        return None
+        return cls()
diff --git a/lihzahrd/timer.py b/lihzahrd/timer.py
index 42843e8..36861db 100644
--- a/lihzahrd/timer.py
+++ b/lihzahrd/timer.py
@@ -3,7 +3,8 @@ import typing
 
 
 class Timer:
-    def __init__(self, name: str, display: bool = False):
+    """An object to track and print the time required to perform a section of code."""
+    def __init__(self, name: str, display: bool = True):
         self.name: str = name
         self.display: bool = display
         self._start_time: typing.Optional[float] = None
diff --git a/lihzahrd/world.py b/lihzahrd/world.py
index 73afdc3..fd1403e 100644
--- a/lihzahrd/world.py
+++ b/lihzahrd/world.py
@@ -11,6 +11,7 @@ from .tileentities import *
 from .pressureplates import *
 from .townmanager import *
 from .timer import Timer
+from .errors import InvalidFooterError
 
 
 class World:
@@ -46,7 +47,7 @@ class World:
                  anglers_quest: AnglerQuest,
                  clouds: Clouds,
                  cultist_delay: int,
-                 tiles: typing.List[typing.List[Tile]],
+                 tiles: TileMatrix,
                  chests: typing.List[Chest],
                  signs: typing.List[Sign],
                  npcs: typing.List[NPC],
@@ -145,7 +146,7 @@ class World:
         self.anglers_quest: AnglerQuest = anglers_quest
         """Information about today's Angler's Quest."""
 
-        self.tiles: typing.List[typing.List[Tile]] = tiles
+        self.tiles: TileMatrix = tiles
         """A matrix of all the tiles present in the world."""
 
         self.chests: typing.List[Chest] = chests
@@ -515,13 +516,13 @@ class World:
             unknown_world_header_data = f.read_until(pointers.world_tiles)
 
         with Timer("World Tiles", display=True):
-            tiles = []
-            while len(tiles) < world_size.x:
+            tm = TileMatrix()
+            while tm.size.x < world_size.x:
                 column = []
                 while len(column) < world_size.y:
                     readtiles = cls._read_tile_block(f, tileframeimportant)
                     column = [*column, *readtiles]
-                tiles.append(column)
+                tm.add_column(column)
 
             unknown_world_tiles_data = f.read_until(pointers.chests)
 
@@ -642,7 +643,7 @@ class World:
                       time=time, events=events, dungeon_point=dungeon_point, world_evil=world_evil,
                       saved_npcs=saved_npcs, altars_smashed=altars_smashed, is_hardmode=is_hardmode,
                       shadow_orbs=shadow_orbs, bosses_defeated=bosses_defeated, anglers_quest=anglers_quest,
-                      clouds=clouds, cultist_delay=cultist_delay, tiles=tiles, chests=chests, signs=signs,
+                      clouds=clouds, cultist_delay=cultist_delay, tiles=tm, chests=chests, signs=signs,
                       npcs=npcs, mobs=mobs, tile_entities=tile_entities,
                       weighed_pressure_plates=weighed_pressure_plates, rooms=rooms,
                       unknown_file_format_data=unknown_file_format_data,
@@ -657,10 +658,10 @@ class World:
 
         with Timer("Footer", display=True):
             if not f.bool():
-                raise Exception("Invalid footer")
+                raise InvalidFooterError("Invalid footer")
             if not f.string() == world.name:
-                raise Exception("Invalid footer")
+                raise InvalidFooterError("Invalid footer")
             if not f.int4() == world.id:
-                raise Exception("Invalid footer")
+                raise InvalidFooterError("Invalid footer")
 
         return world