The 'Hydrocity or Hydro City' meme centers on a decades-long debate within the Sonic the Hedgehog fandom regarding the correct pronunciation of the 'Hydrocity Zone' level in Sonic the Hedgehog 3. One side argues for 'Hydro-City' (a combination of water and city), while the other favors 'Hydros-ity' (rhyming with velocity), suggesting a play on water and speed. The debate gained mainstream meme status as fans used various templates to mock the intensity of the disagreement. Even official SEGA representatives and sound composers have weighed in, though the community remains hilariously divided, turning the linguistic quirk into a symbol of nostalgic gaming pedantry.