Puzzle variants as parent / child articles

Allow users to create variants of puzzles on the listing page for a puzzle. Adding a variant requires a unique subtitle such as appending "Ice Edition" or "Titanium Edition" to the end of the puzzle's main name "Rubik's Revolution". Variants can be browsed via a selector near the listing title, and can be collected separately by users. Variants will inherit the information associated with the base puzzle when it was made, but this info can be specified separately when needed, overriding the parent puzzles info (such as a description that adds additional information about the variant).