Retro Engine v4¶ Retro Engine v4, debuting in 2013, is the version of RSDK used for the Sonic 1 and Sonic 2 remasters. TODO: write info about RSDKv4 and anything relating to S1/S2 Documentation¶ Overview Events Variables Functions Tools¶ RetroED RSDK Animation Editor Tutorials¶ TODO: yo m Other Resources¶