new file mode 100644
--- /dev/null
+++ b/pytouhou/formats/pbg3.py
@@ -0,0 +1,71 @@
+from pytouhou.utils.bitstream import BitStream
+import pytouhou.utils.lzss as lzss
+
+
+class PBG3BitStream(BitStream):
+    def read_int(self):
+        size = self.read(2)
+        return self.read((size + 1) * 8)
+
+
+    def read_string(self, maxsize):
+        string = []
+        for i in range(maxsize):
+            byte = self.read(8)
+            if byte == 0:
+                break
+            string.append(byte)
+        return ''.join(chr(byte) for byte in string)
+
+
+
+class PBG3(object):
+    def __init__(self, entries, bitstream=None):
+        self.entries = entries
+        self.bitstream = bitstream #TODO
+
+
+    @classmethod
+    def read(cls, file):
+        magic = file.read(4)
+        if magic != b'PBG3':
+            raise Exception #TODO
+
+        bitstream = PBG3BitStream(file)
+        entries = {}
+
+        nb_entries = bitstream.read_int()
+        offset = bitstream.read_int()
+        bitstream.seek(offset)
+        for i in range(nb_entries):
+            unknown1 = bitstream.read_int()
+            unknown2 = bitstream.read_int()
+            checksum = bitstream.read_int() # Checksum of *compressed data*
+            offset = bitstream.read_int()
+            size = bitstream.read_int()
+            name = bitstream.read_string(255).decode('ascii')
+            entries[name] = (unknown1, unknown2, checksum, offset, size)
+
+        return PBG3(entries, bitstream)
+
+
+    def list_files(self):
+        return self.entries.keys()
+
+
+    def extract(self, filename, check=False):
+        unkwn1, unkwn2, checksum, offset, size = self.entries[filename]
+        self.bitstream.seek(offset)
+        data = lzss.decompress(self.bitstream, size)
+        if check:
+            # Checking the checksum
+            compressed_size = self.bitstream.io.tell() - offset
+            self.bitstream.seek(offset)
+            value = 0
+            for c in self.bitstream.io.read(compressed_size):
+                value += ord(c)
+                value &= 0xFFFFFFFF
+            if value != checksum:
+                print('Warning: corrupted data') #TODO
+        return data
+