-freely-redistributable MUD core engine which can be easily understood and
-extended. It is written in pure Python (currently compatible with 2.5 and later
-2.x versions) and has no prerequisite dependencies beyond Python and its
-built-in modules. All configuration and data are stored in
-consistently-formatted plain text files for ease of administration. The core
-engine is unicode-clean internally and supports UTF-8 encoding for input and
+freely-redistributable MUD core engine which can be easily understood
+and extended. It is written in pure Python (currently compatible with
+3.3 and later versions) and has only pure Python dependencies. All
+configuration and data are stored in consistently-formatted plain text
+(YAML) files for ease of administration. The core engine is
+unicode-clean internally and supports UTF-8 encoding for input and