19, currently. I will be getting Sonic Boom when it comes out.
List: Sonic Adventure DX (GC) Sonic Adventure 2: Battle (GC) Sonic bayani (GC) Shadow The Hedgehog (GC) Sonic Rush (DS) Sonic Rush Adventure (DS) Sonic Riders: Zero Gravity (Wii) Sonic Unleashed (Wii) Sonic Chronicles: The Dark Brotherhood (DS) Sonic And The Secret Rings (Wii) Sonic And The Black Knight (Wii) Mario And Sonic At The Olympic Games (Wii) Mario And Sonic At The Olympic Games (DS) Mario And Sonic At The Olympic Winter Games (DS) Mario And Sonic At The London 2012 Olympic Games (Wii) Mario And Sonic At The London 2012 Olympic Games (3DS) Sonic mga kulay (Wii) Sonic And Sega All Stars Racing (Wii) Sonic And All Stars Racing Transformed (Wii U) Sonic Generations (3DS)
Let's see... Sonic the Hedgehog Sonic the Hedgehog 2 Sonic the Hedgehog 3 Sonic and Knuckles Knuckles in Sonic 2 Knuckles in Sonic 3 Sonic CD Sonic Adventure Shadow the Hedgehog Sonic 06 Sonic and the Black Knight Sonic Unleashed Sonic Chronicles: The Dark Brotherhood Sonic and SEGA All-Stars Racing Sonic Jump Sonic Generations Sonic Dash Sonic Nawawala World (And, if they count, Super Smash Bros. Brawl and all the Mario and Sonic at the Olympic Games) So, 18 Sonic games, 23 if you count the ones with Mario.
lets see PC sonic adventure sonicadventure dx GAME CUBE sonic adventure 2 battle sonic heroes shadow the hedgehog sonic riders GAME BOY ADVANCE sonic advance // // 2 // // 3 sonic battle i can only remember these
