This Twin Pack Combines arguably the best games in the Sonic (Genesis) Series. It contains Sonic CD, known for the best Genesis graphics, detail, and unique backgrounds, as well as being the most intuitive sonic game with "past", and "future" mechanics that make the game more interesting. Also, It includes the debut of Sonic's love interest, Amy Rose, and his robot counterpart, Metal Sonic! It also Contains The Sonic & Knuckles Collection. The Sonic & Knuckles Collection includes Sonic The Hedgehog 3, Sonic and Knuckles, and Sonic 3 & Knuckles (the functionality of the lock-on technology ported over to the PC). With Sonic 3 & Knuckles, you can play the game as it was originally meant to be played! Play as Sonic, Tails, Sonic & Tails, or Knuckles. Sonic has signature speed and special item box abilities, Tails can fly, and Knuckles can glide and access secret areas. Also, when playing as Sonic & Tails, Player 2 can play co-op and play as Tails! Sonic 3 & Knuckles also has some of the best fights ever (Read: Super Metal Sonic II). Collect all 7 Chaos Emeralds, then turn them into Super Emeralds, and become Hyper Sonic, Hyper Knuckles, or Hyper Tails in Sonic 3 & Knuckles! This is probably the best collection of sonic games you can get on PC CD-ROM!