The beautiful, chaotic hybrid where
fanfiction and fangames collide, allowing you to not only read about your favorite characters doing things that would never happen in canon, but to actively control them while they do it. It's the art of turning a written "what if" scenario into a playable experience, or conversely, taking an existing fangame and writing an elaborate backstory novel for its obscure, player-created characters. It's
the ultimate expression of fan ownership: if the official creators won't give you
the content you want, you'll both write it AND code it yourself.
Example: "I spent all weekend playing a fanfictiongame where you play as Draco Malfoy's jealous house-elf, and you have to sabotage his dates with
Hermione by magically tangling his robes. The writing was
terrible, but the quick-time events were
surprisingly engaging."