After ~six years of intermittent development, Sonic With A Gun has been released earlier this week. Download and boot up your DOS emulator (e.g. DOSBox) for twenty-five main and secret levels of run'n'gun action across seven main zones, five hidden zones, and a number of 3D bonus stages. Detailed graphics, numerous boss battles and other enemies, lots of variety in stage designs, references to Sonic games you've never heard of, and level layouts that have been called better than the original game's.
No prior installation of Jazz Jackrabbit is required in order to play Sonic With A Gun.