[quote="Neo Rasa"]The Dreamcast Smash Pack had Flicky, Sega Swirl and several other games, the PC Smash Packs were something of a completely seperate line that had been released/recompiled/etc. throughout the mid nineties and up.
What? The two PC Sega Smash Packs used a special version of the commonly-available Kega emulator. This is well documented. (I think there's even a reference to it that can be seen in the emulator code.)
I'm not sure if the same was done for Sonic & Knuckles, the Sega Puzzle Pack (Mean Bean Machine + Columns + Lose Your Marbles), Garfield: Caught in the Act, or Sonic 3D. Certainly, Comix Zone was recompiled.
Sega Smash Pack 2 (including Sonic 2), Sonic & Knuckles Collection, Sonic CD, and Sonic R. That is all: No Sonic 1 or Knuckles Chaotix (or Sonic 3D, for that matter).If you look around now there's even ones that pack together every 2D Sonic game up to Knuckles Chaotix for not too much.