diff --git a/src/mudlib/zmachine/zopdecoder.py b/src/mudlib/zmachine/zopdecoder.py
index b734934..60613f9 100644
--- a/src/mudlib/zmachine/zopdecoder.py
+++ b/src/mudlib/zmachine/zopdecoder.py
@@ -70,7 +70,7 @@ class ZOpDecoder:
         log(f"Decode opcode {opcode:x}")
 
         # Determine the opcode type, and hand off further parsing.
-        if self._memory.version == 5 and opcode == 0xBE:
+        if self._memory.version >= 5 and opcode == 0xBE:
             # Extended opcode
             return self._parse_opcode_extended()
 
@@ -134,7 +134,16 @@ class ZOpDecoder:
 
     def _parse_opcode_extended(self):
         """Parse an extended opcode (v5+ feature)."""
-        raise NotImplementedError("Extended opcodes (v5+) not yet implemented")
+        log("Opcode is extended")
+
+        # Read the extended opcode number
+        opcode_num = self._get_pc()
+        log(f"Extended opcode number: {opcode_num:x}")
+
+        # Parse the operand types byte and retrieve operands
+        operands = self._parse_operands_byte()
+
+        return (OPCODE_EXT, opcode_num, operands)
 
     def _parse_operand(self, operand_type):
         """Read and return an operand of the given type.