User blog comment:Charcoal121/EA Comments On Why It Chose Battlefield 4 Over Bad Company 3/@comment-4689659-20120720182529/@comment-2224289-20120724084142

I'd define as core Battlefield all Refractor BF's (BF1942, BFV, BF2 and BF2142) and Battlefield 3. Spin-offs in my eyes is Battlefield 2: Modern Combat, Battlefield 1943 (although it could be a bit debatable), Battlefield Heroes, Battlefield Play4Free and the Bad Company series.