
SAGE 2014 Overview: Sonic Max
Players at the 2014 Sonic Amateur Games Expo are giving good marks to the tech demo of Sonic Max, the GameMaker Studio based and Sonic 2 inspired engine recreation.
Project lead TruePowerofTeamwork explains the concept:

Based on Sonic 2, Sonic MAX is an attempt at making an engine as accurate as possible, with many objects and gimmicks from various Genesis Sonic games. This demo includes a simple recreation of Emerald Hill Zone Act 1 from Sonic 2, to showcase the physics, and 2 test levels to showcase other objects and gimmicks.Sonic MAX was planned to be open source, by SAGE Act 2, but I haven’t had enough time to polish and organize the code.
If you’d like to try it out, the engine features Sonic and Tails in a recreated Emerald Hill Zone. You can see it by going to SAGE, clicking on the Games tab, and looking for the Sonic Max button.