diff --git a/minecraft/managers/chunks.py b/minecraft/managers/chunks.py
new file mode 100644
index 0000000..ce37314
--- /dev/null
+++ b/minecraft/managers/chunks.py
@@ -0,0 +1,98 @@
+from math import floor
+
+from ..networking.packets import clientbound
+
+class ChunksManager:
+
+    def __init__(self, data_manager):
+        self.data = data_manager
+        self.chunks = {}
+        self.biomes = {}
+        
+    def handle_block(self, block_packet):
+        self.set_block_at(block_packet.location.x, block_packet.location.y, block_packet.location.z, block_packet.block_state_id)
+        #self.print_chunk(self.get_chunk(floor(block_packet.location.x/16), floor(block_packet.location.y/16), floor(block_packet.location.z/16)), block_packet.location.y%16)
+        #print('Block %s at %s'%(blocks_states[block_packet.block_state_id], block_packet.location))
+
+    def handle_multiblock(self, multiblock_packet):
+        for b in multiblock_packet.records:
+            self.handle_block(b)
+
+    def handle_chunk(self, chunk_packet):
+        print(f"Chunk: {chunk_packet}")
+        for i in chunk_packet.chunks:
+            self.chunks[(chunk_packet.x, i, chunk_packet.z)] = chunk_packet.chunks[i]        
+        self.biomes[(chunk_packet.x, None, chunk_packet.z)] = chunk_packet.biomes # FIXME
+
+    def register(self, connection):
+     #   connection.register_packet_listener(self.handle_block, clientbound.play.BlockChangePacket)
+      #  connection.register_packet_listener(self.handle_multiblock, clientbound.play.MultiBlockChangePacket)
+        connection.register_packet_listener(self.handle_chunk, clientbound.play.ChunkDataPacket)
+
+    def get_chunk(self, x, y, z):
+        index = (x, y, z)
+        if not index in self.chunks:
+            raise ChunkNotLoadedException(index)
+        return self.chunks[index]
+
+    def get_loaded_area(self, ignore_empty=False):
+        first = next(iter(self.chunks.keys()))
+        x0 = x1 = first[0]
+        y0 = y1 = first[1]
+        z0 = z1 = first[2]
+        for k in self.chunks.keys():
+            if ignore_empty and self.chunks[k].empty:
+                continue
+            x0 = min(x0, k[0])
+            x1 = max(x1, k[0])
+            y0 = min(y0, k[1])
+            y1 = max(y1, k[1])
+            z0 = min(z0, k[2])
+            z1 = max(z1, k[2])
+        return ((x0,y0,z0),(x1,y1,z1))
+
+    def get_block_at(self, x, y, z):
+        c = self.get_chunk(floor(x/16), floor(y/16), floor(z/16))
+        return c.get_block_at(x%16, y%16, z%16)
+
+    def set_block_at(self, x, y, z, block):
+        c = self.get_chunk(floor(x/16), floor(y/16), floor(z/16))
+        c.set_block_at(x%16, y%16, z%16, block)
+
+    def print_chunk(self, chunk, y_slice):
+        print("This is chunk %d %d %d at slice %d:"%(chunk.x, chunk.y, chunk.z, y_slice))
+        print("+%s+"%("-"*16))
+        # for z in range(16):
+        #     missing = []
+        #     print("|", end="")
+        #     for x in range(16):
+        #         sid = chunk.get_block_at(x, y_slice, z)
+        #         bloc = self.data.blocks_states[sid]
+        #         if bloc == "minecraft:air" or bloc == "minecraft:cave_air":
+        #             c = " "
+        #         elif bloc == "minecraft:grass_block" or bloc == "minecraft:dirt":
+        #             c = "-"
+        #         elif bloc == "minecraft:water":
+        #             c = "~"
+        #         elif bloc == "minecraft:lava":
+        #             c = "!"
+        #         elif bloc == "minecraft:bedrock":
+        #             c = "_"
+        #         elif bloc == "minecraft:stone":
+        #             c = "X"
+        #         else:
+        #             missing.append(bloc)
+        #             c = "?"
+
+        #         print(c, end="")
+        #     print("|  %s"%(",".join(missing)))
+        # print("+%s+"%("-"*16))
+        if chunk.entities:
+            print("Entities in slice: %s"%(", ".join([x['id'].decode() for x in chunk.entities])))
+
+
+class ChunkNotLoadedException(Exception):
+    def __str__(self):
+        pos = self.args[0]
+        return "Chunk at %d %d %d not loaded (yet?)"%(pos[0], pos[1], pos[2])
+
diff --git a/minecraft/managers/data.py b/minecraft/managers/data.py
new file mode 100644
index 0000000..cb480ea
--- /dev/null
+++ b/minecraft/managers/data.py
@@ -0,0 +1,36 @@
+import os
+import json
+
+
+class DataManager:
+
+    def __init__(self, directory):
+        self.blocks = {}
+        self.blocks_states = {}
+        self.blocks_properties = {}
+        self.registries = {}
+        self.biomes = {}
+        self.entity_type = {}
+
+        if not os.path.isdir(directory):
+            raise FileNotFoundError("%s is not a valid directory")
+
+        if not os.path.isfile("%s/registries.json" % (directory)):
+            raise FileNotFoundError(
+                "%s is not a valid minecraft data directory")
+
+        with open("%s/blocks.json" % (directory)) as f:
+            blocks = json.loads(f.read())
+        for x in blocks:
+            for s in blocks[x]['states']:
+                self.blocks_states[s['id']] = x
+                self.blocks_properties[s['id']] = s.get('properties', {})
+
+        with open("%s/registries.json" % (directory)) as f:
+            registries = json.loads(f.read())
+        for x in registries["minecraft:biome"]["entries"]:
+            self.biomes[registries["minecraft:biome"]
+                        ["entries"][x]["protocol_id"]] = x
+        for x in registries["minecraft:entity_type"]["entries"]:
+            self.entity_type[registries["minecraft:entity_type"]
+                             ["entries"][x]["protocol_id"]] = x
diff --git a/minecraft/networking/connection.py b/minecraft/networking/connection.py
index bc15b61..74fc970 100644
--- a/minecraft/networking/connection.py
+++ b/minecraft/networking/connection.py
@@ -33,7 +33,8 @@ class ConnectionContext(object):
 
     def __init__(self, **kwds):
         self.protocol_version = kwds.get("protocol_version")
-
+       # self.protocol_version = 340
+        
     def protocol_earlier(self, other_pv):
         """Returns True if the protocol version of this context was published
            earlier than 'other_pv', or else False."""
@@ -447,6 +448,7 @@ def connect(self):
             # It is important that this is set correctly even when connecting
             # in status mode, as some servers, e.g. SpigotMC with the
             # ProtocolSupport plugin, use it to determine the correct response.
+            # self.context.protocol_version = 340
             self.context.protocol_version \
                 = max(self.allowed_proto_versions,
                       key=PROTOCOL_VERSION_INDICES.get)
diff --git a/minecraft/networking/packets/clientbound/play/__init__.py b/minecraft/networking/packets/clientbound/play/__init__.py
index 6959162..df6020b 100644
--- a/minecraft/networking/packets/clientbound/play/__init__.py
+++ b/minecraft/networking/packets/clientbound/play/__init__.py
@@ -24,6 +24,9 @@
 from .join_game_and_respawn_packets import JoinGamePacket, RespawnPacket
 from .destroy_entities_packet import DestroyEntitiesPacket
 from .spawn_mob_packet import SpawnMobPacket
+from .chunk_data import ChunkDataPacket
+
+# from .unknown_packet import UnknownPacket
 
 # Formerly known as state_playing_clientbound.
 
@@ -58,7 +61,8 @@ def get_packets(context):
         BlockActionPacket,
         EntityHeadLookPacket,
         ResourcePackSendPacket,
-        NBTQueryPacket
+        NBTQueryPacket,
+        ChunkDataPacket
     }
 
     if context.protocol_earlier_eq(47):
diff --git a/minecraft/networking/packets/clientbound/play/chunk_data.py b/minecraft/networking/packets/clientbound/play/chunk_data.py
new file mode 100644
index 0000000..baa0f56
--- /dev/null
+++ b/minecraft/networking/packets/clientbound/play/chunk_data.py
@@ -0,0 +1,137 @@
+from math import floor
+
+from minecraft.networking.packets import Packet, PacketBuffer
+from minecraft.networking.types import (
+    VarInt, Integer, Boolean, UnsignedByte, Long, Short,
+    multi_attribute_alias, Vector, UnsignedLong, Nbt
+)
+
+
+class ChunkDataPacket(Packet):
+    @staticmethod
+    def get_id(context):
+        return 0x3C  # FIXME
+
+    packet_name = 'chunk data'
+    fields = 'x', 'bit_mask_y', 'z', 'full_chunk'
+
+    def read(self, file_object):
+        self.x = Integer.read(file_object)
+        self.z = Integer.read(file_object)
+        self.full_chunk = Boolean.read(file_object)
+        self.bit_mask_y = VarInt.read(file_object)
+        self.heightmaps = Nbt.read(file_object)
+        self.biomes = []
+        if self.full_chunk:
+            for i in range(1024):
+                self.biomes.append(Integer.read(file_object))
+        size = VarInt.read(file_object)
+        self.data = file_object.read(size)
+        size_entities = VarInt.read(file_object)
+        self.entities = []
+        for i in range(size_entities):
+            self.entities.append(Nbt.read(file_object))
+
+        self.decode_chunk_data()
+
+    def write_fields(self, packet_buffer):
+        Integer.send(self.x, packet_buffer)
+        Integer.send(self.z, packet_buffer)
+        Boolean.send(self.full_chunk, packet_buffer)
+        VarInt.send(self.bit_mask_y, packet_buffer)
+        Nbt.send(self.heightmaps, packet_buffer)
+        if self.full_chunk:
+            for i in range(1024):
+                Integer.send(self.biomes[i], packet_buffer)
+        VarInt.send(len(self.data), packet_buffer)
+        packet_buffer.send(self.data)
+        VarInt.send(len(self.entities), packet_buffer)
+        for e in self.entities:
+            Nbt.send(e, packet_buffer)
+
+    def decode_chunk_data(self):
+        packet_data = PacketBuffer()
+        packet_data.send(self.data)
+        packet_data.reset_cursor()
+
+        self.chunks = {}
+        for i in range(16):  # 0-15
+            self.chunks[i] = Chunk(self.x, i, self.z)
+            if self.bit_mask_y & (1 << i):
+                self.chunks[i].read(packet_data)
+
+        for e in self.entities:
+            y = e['y']
+            self.chunks[floor(y/16)].entities.append(e)
+
+
+class Chunk:
+
+    position = multi_attribute_alias(Vector, 'x', 'y', 'z')
+
+    def __init__(self, x, y, z, empty=True):
+        self.x = x
+        self.y = y
+        self.z = z
+        self.empty = empty
+        self.entities = []
+
+    def __repr__(self):
+        return 'Chunk(%r, %r, %r)' % (self.x, self.y, self.z)
+
+    def read(self, file_object):
+        self.empty = False
+        self.block_count = Short.read(file_object)
+        self.bpb = UnsignedByte.read(file_object)
+        if self.bpb <= 4:
+            self.bpb = 4
+
+        if self.bpb <= 8:  # Indirect palette
+            self.palette = []
+            size = VarInt.read(file_object)
+            for i in range(size):
+                self.palette.append(VarInt.read(file_object))
+        else:  # Direct palette
+            self.palette = None
+
+        size = VarInt.read(file_object)
+        longs = []
+        for i in range(size):
+            longs.append(UnsignedLong.read(file_object))
+
+        self.blocks = []
+        mask = (1 << self.bpb)-1
+        for i in range(4096):
+            l1 = int((i*self.bpb)/64)
+            offset = (i*self.bpb) % 64
+            l2 = int(((i+1)*self.bpb-1)/64)
+            n = longs[l1] >> offset
+            if l2 > l1:
+                n |= longs[l2] << (64-offset)
+            n &= mask
+            if self.palette:
+                n = self.palette[n]
+            self.blocks.append(n)
+
+    def write_fields(self, packet_buffer):
+        pass  # TODO
+
+    def get_block_at(self, x, y, z):
+        if self.empty:
+            return 0
+        return self.blocks[x+y*256+z*16]
+
+    def set_block_at(self, x, y, z, block):
+        if self.empty:
+            self.init_empty()
+        self.blocks[x+y*256+z*16] = block
+
+    def init_empty(self):
+        self.blocks = []
+        for i in range(4096):
+            self.blocks.append(0)
+        self.empty = False
+
+    @property
+    def origin(self):
+        return self.position*16
diff --git a/minecraft/networking/packets/clientbound/play/unknown_packet.py b/minecraft/networking/packets/clientbound/play/unknown_packet.py
new file mode 100644
index 0000000..f1c0895
--- /dev/null
+++ b/minecraft/networking/packets/clientbound/play/unknown_packet.py
@@ -0,0 +1,66 @@
+from minecraft.networking.types import (
+    Vector, Float, Byte, Integer, PrefixedArray, multi_attribute_alias, Type,
+    VarInt,
+)
+
+
+from minecraft.networking.types import (
+    Type, Boolean, UnsignedByte, Byte, Short, UnsignedShort,
+    Integer, FixedPoint, FixedPointInteger, Angle, VarInt, VarLong,
+    Long, UnsignedLong, Float, Double, ShortPrefixedByteArray,
+    VarIntPrefixedByteArray, TrailingByteArray, String, UUID,
+    Position, NBT, PrefixedArray,        
+    Type, VarInt, VarLong, UnsignedLong, Integer, UnsignedByte, Position,
+    Vector, MutableRecord, PrefixedArray, Boolean, attribute_alias, String
+)
+
+from minecraft.networking.packets import Packet
+
+
+class UnknownPacket(Packet):
+    @staticmethod
+    def get_id(context):
+        # return 0x20
+        # return 0x16
+        # return 0x4E
+        return 0x3F
+
+#      13 --> [unknown packet] 0x3C Packet
+#      19 --> [unknown packet] 0x16 Packet
+#      66 --> [unknown packet] 0x21 Packet
+#      81 --> [unknown packet] 0x20 Packet 
+#     137 --> [unknown packet] 0x1E Packet
+#     472 --> [unknown packet] 0x4C Packet
+#    1029 --> [unknown packet] 0x27 Packet   - No
+
+    packet_name = 'unknown'
+
+    class Record(Vector, Type):
+        __slots__ = ()
+
+        @classmethod
+        def read(cls, file_object):
+            return cls(*(Byte.read(file_object) for i in range(3)))
+
+        @classmethod
+        def send(cls, record, socket):
+            for coord in record:
+                Byte.send(coord, socket)
+
+    @staticmethod
+    def get_definition(context):
+        return [
+            {'entity_id': VarInt},
+            {'y': Angle},
+            {'z': Short}
+            # {'player_motion_x': VarInt},
+            # {'player_motion_y': Float},
+            # {'player_motion_z': Float},
+        ]
+
+    # Access the 'x', 'y', 'z' fields as a Vector tuple.
+    position = multi_attribute_alias(Vector, 'x', 'y', 'z')
+
+    # Access the 'player_motion_{x,y,z}' fields as a Vector tuple.
+    player_motion = multi_attribute_alias(
+        Vector, 'player_motion_x', 'player_motion_y', 'player_motion_z')
diff --git a/minecraft/networking/types/nbt.py b/minecraft/networking/types/nbt.py
new file mode 100644
index 0000000..2626c28
--- /dev/null
+++ b/minecraft/networking/types/nbt.py
@@ -0,0 +1,93 @@
+"""Contains definition for minecraft's NBT format.
+"""
+from __future__ import division
+import struct
+
+from .utility import Vector
+from .basic import Type, Byte, Short, Integer, Long, Float, Double, ShortPrefixedByteArray, IntegerPrefixedByteArray
+
+__all__ = (
+    'Nbt',
+)
+
+TAG_End = 0
+TAG_Byte = 1
+TAG_Short = 2
+TAG_Int = 3
+TAG_Long = 4
+TAG_Float = 5
+TAG_Double = 6
+TAG_Byte_Array = 7
+TAG_String = 8
+TAG_List = 9
+TAG_Compound = 10
+TAG_Int_Array = 11
+TAG_Long_Array = 12
+
+
+class Nbt(Type):
+
+    @staticmethod
+    def read(file_object):
+        type_id = Byte.read(file_object)
+        if type_id != TAG_Compound:
+            raise Exception("Invalid NBT header")
+        name = ShortPrefixedByteArray.read(file_object).decode('utf-8')
+        a = Nbt.decode_tag(file_object, TAG_Compound)
+        a['_name'] = name
+        return a
+
+    @staticmethod
+    def decode_tag(file_object, type_id):
+        if type_id == TAG_Byte:
+            return Byte.read(file_object)
+        elif type_id == TAG_Short:
+            return Short.read(file_object)
+        elif type_id == TAG_Int:
+            return Integer.read(file_object)
+        elif type_id == TAG_Long:
+            return Long.read(file_object)
+        elif type_id == TAG_Float:
+            return Float.read(file_object)
+        elif type_id == TAG_Double:
+            return Double.read(file_object)
+        elif type_id == TAG_Byte_Array:
+            return IntegerPrefixedByteArray.read(file_object).decode('utf-8')
+        elif type_id == TAG_String:
+            return ShortPrefixedByteArray.read(file_object)
+        elif type_id == TAG_List:
+            list_type_id = Byte.read(file_object)
+            size = Integer.read(file_object)
+            a = []
+            for i in range(size):
+                a.append(Nbt.decode_tag(file_object, list_type_id))
+            return a
+        elif type_id == TAG_Compound:
+            c = { }
+            child_type_id = Byte.read(file_object)
+            while child_type_id != TAG_End:
+                child_name = ShortPrefixedByteArray.read(file_object).decode('utf-8')
+                c[child_name] = Nbt.decode_tag(file_object, child_type_id)
+                child_type_id = Byte.read(file_object)
+            return c
+        elif type_id == TAG_Int_Array:
+            size = Integer.read(file_object)
+            a = []
+            for i in range(size):
+                a.append(Integer.read(file_object))
+            return a
+        elif type_id == TAG_Long_Array:
+            size = Integer.read(file_object)
+            a = []
+            for i in range(size):
+                a.append(Long.read(file_object))
+            return a
+        else:
+            raise Exception("Invalid NBT tag type")
+
+    @staticmethod
+    def send(value, socket):
+        # TODO
+        pass
+
+