Direct answer: There are 13 Sonic titles listed as PlayStation 3 games on the Sonic fandom category for PS3.

Quick details (what that count includes)

  • The fandom category lists all Sonic-related releases that have a PS3 release or PS3 listing, and its total is shown as 13 items.
  • Common PS3 Sonic releases mentioned across community and video sources include main-series entries (Sonic Unleashed, Sonic Generations), compilations (Sonic’s Ultimate/Genesis collections), racing and spin-off titles (Sonic & SEGA All-Stars Racing, Sonic & All-Stars Racing Transformed), downloadable episodes (Sonic the Hedgehog 4: Episode I/II), and ports of older Sonic Adventure/CD/Adventure 2 entries or their collections.
  • The fandom page also notes that PS3 Sonic releases were typically released on other platforms (Xbox 360/PC) rather than as PS3 exclusives.

If you want a precise list (title-by-title) in HTML table form, I can produce it using the fandom list plus cross-checks against sources like Wikipedia and community guides — would you like that table?

Bottom note: Information gathered from public forums or data available on the internet and portrayed here.