Sonic Action 4 Pack is a PC Collection that was released in 2001. The games are Sonic the Hedgehog CD and Sonic R, as well as the Sonic & Knuckles Collection which itself includes the PC versions of Sonic the Hedgehog 3, Sonic & Knuckles, and Sonic 3 & Knuckles. The bundle also includes the PC version of the Sega Smash Pack 2, which features Sonic the Hedgehog 2, Shining Force, Vectorman, Super Hang-On, Kid Chameleon, Flicky, Comix Zone, and Sega Swirl.