Sonic the Hedgehog games in order

All 8 games of the Sonic the Hedgehog series in the order they came out, from Sonic the Hedgehog (1991) to Sonic & Knuckles (1994).

1. 
   Sonic the HedgehogMac, Arcade, Genesis +23 · Konami, Sonic Team
   8123 Jun
2. 
   Sonic the HedgehogSMS, GG, Wii · Ancient
   828 Oct
3. 
   Sonic the Hedgehog 2SMS, GG, Wii +1 · Aspect
   9016 Oct
4. 
   Sonic the Hedgehog 2Mac, Linux, Arcade +16 · Sonic Team
   8621 Nov
5. 
   Sonic the Hedgehog CDGenesis, Sega CD, PC +6 · Sonic Team
   7423 Sep
6. 
   Sonic ChaosSMS, GG, Wii · Aspect
   8625 Oct
7. 
   Sonic the Hedgehog 3PC, Genesis, Wii +2 · Sonic Team
   832 Feb
8. 
   Sonic & KnucklesPC, Mac, Linux +8 · Sonic Team
   8018 Oct