Hello I'm here to give you some Sonic engines for game maker,both 3D and 2D,check it out Very Happy.
2D

Dekoldrick and the Fgx Insider's Sonic Dev Engine; Formally Called Sonic Worlds: GM (Epic!)
Link:http://www.mediafire.com/download/znhe5xwzbu2/Sonic+Dev+engine.zip
Tyrelld8 Sonic Adventure 3 Engine(Real Nice!)
Link:http://gmc.yoyogames.com/index.php?showtopic=524743
Features
*360 rotation
* Homing Attack - Space Bar (when near an enemy) (Modern Sonic only)
*Spin Dash - Z button (hold longer for faster takeoff) (Classic Era only)
*Super Peel Out - X Button (wait for the figure-8 feet) (Classic Normal Sonic only)
*Light Dash - C button (when near rings) (Modern Sonic only)
*Boost Attack - Z button (Modern Sonic only)
*Fly (Sonic) - Hold Z button and use Arrow Keys to move (if none are pressed, he floats mid-air)(press Up or W when on the ground)(Modern Super Sonic only)
*Fly (Tails) - Press the Space Bar once to start; press repeatedly to keep flying.
*Charge Attack - X button (Classic Super Sonic only)
*W Kaiten Attack - Space Bar (in air) (Classic Normal Sonic only)
*Roll - Down (when moving) (for all)
*Air Dash - Space Bar (in air) (Modern Sonic only)
*Wall Jump - Approach a Yellow wall while jumping; keep jumping to reach higher ground (Modern Sonic only)
*Stomp - Press the X button while in the air (Modern Sonic only)
*Slide - Press the X button while on the ground (Modern Sonic only)
*Transform - C button with 50 Rings or more (Normal Sonic only)
Here are the basic controls:
* Walk / Run - Left and Right Keys
* Jump - Space Bar
* Look Up / Crouch Down - Up and Down, respectively
* Brake / Decelerate - Button opposite in direction (if left, then right, and vice versa)
Right now I using this engine for my own Hero 3.
The Sonic Revival Engine by Chaos Rush(Smooth)
Link http://gmc.yoyogames.com/index.php?showtopic=445833
Sonic Advance Engine by Lewis Cross
Link:http://www.gamemakergames.com/archive/sonic-advance-engine
SONIC_EXTREME_HYPERSPEED(Best!)(Sonic fangame, Testrun, effects on middle) by ZARBOMBA
Sonic Revival engine used
rapidshare.com rapidshare.comSONIC_EXTREME_HYPERSPEED.rar
Sonic The Hedgehog Lite Engine created also by Xenonite11(No need for the full version of GM,YAY!)
Link:http://sandbox.yoyogames.com/games/167242/download
Sonic Dash and Dash + (also known as the Sonic Xmas Engine) is an open-source Sonic the Hedgehog engine created by Damizean and RogueYoshi(AI! and Azure Lake Zone! OMG YAY)
Link:http://info.sonicretro.org/Sonic_Dash
Sonic Ultima Engine by Alex Z
Link:http://gmc.yoyogames.com/index.php?showtopic=327823
Iso Sonic Engine New
by DanF and bob_the_flying_monkey
Link:http://gmc.yoyogames.com/index.php?showtopic=381637
Super Sonic SRU Tutorial created by DoctorSonic1 (Want Supa Sonic for your Sonic Revival?)
Link:http://sandbox.yoyogames.com/games/204267/download
The Super Ring Engine The open source Sonic engine for GM 8 by MalcomX and mrpeanut188 (Tons of Gimmicks)
Link:http://gmc.yoyogames.com/index.php?showtopic=535393
For others check out http://www.sonicfangameshq.com/forum/showthread.php?t=5599
More soon..
3D
Sonic 3d engine example created by Gamer Dee (Very epic)
Link:http://sandbox.yoyogames.com/games/182079/download
Sonic Simple 3D Engine created by my bf on DA, Nikko the cat (IT HAS LOOPS!LOOPS!!!)
Link:http://sandbox.yoyogames.com/games/205431/download
Sonic 3D Engine v4 created by Yal
Link:http://sandbox.yoyogames.com/games/143227/download
Sonic- 2_5D Demo 1_2 created by Xenonite11
No Source yet but he said he would release it
Link:http://sandbox.yoyogames.com/games/221738-sonic-25d-engine--open-source-beta-100
Mario 3d Engine V3.9 created by Triplejctick(real nice,replace the sprites wit some Sonic Xtreme sprite and you got Sonic Xtreme)
Link:http://sandbox.yoyogames.com/games/69352/download
More soon..
give credit to the creators
hey your game could be in the next SAGE