Sonic And The Mystic Gems (previously known as Sonic 1 Harder Levels) is a hack made by Eduardo Knuckles and his team Harder Project of Sonic the Hedgehog on the Sega Mega Drive. It began in 2005 with the simple purpose of being a generic Sonic 1 for Sega Genesis with increase difficulty and revamped versions of the original levels. But now, it's going to present a completely new gaming experience with a new style of level layouts full of paths everywhere among new enemies, new objects, new character abilities, new menus, completely different styles of the Sonic 1 special stages and much more!

Credits and Special Thanks

• Mistergambit for his Spring Yard Zone and Labyrinth Zone level art used in the game.
• Tweaker for his information regarding music importing, bug fixes and the speedcap removal.
• HPZMan for the new sound driver instruments and the dynamic tile-set system.
• Selbi for some new exclusive ASM things and improvements.
• Master3k for sending and fixing some music.
• nineko for creating the xm3smps tool which was essential for the creation of some songs. Special credits to him for the different songs per act system used.
• SCAA for their art.
• Puto for his tutorial to add Spin Dash.
• FraGag for his tutorial to fix the spike bug.
• SonicVaan for beta testing.
• HCKTROX for the lead programming and bug fixing.
• GenesisFan64 for the save screen menu, for some fixes related to the fade-out and others.
• MarkeyJester for lots of important code and a whole load of others.
• Irixion for beta testing.
• PsychoSk8r for his the dynamic palettes tutorial.
• Esrael for fixing essential things in the new sound driver.
• Prilix Bõkun for bug searching and beta-testing
• Estlib for various art stuff related to levels and for additional help with creation of gimmicks and objects
• DJ. Joker27 for his very big importance in specific level and misc music
• Mighty Arnold for additional support with beta-testing and level layout design

Kenny0989 for additional support in the music department Special credits to Harder Project's Team by all the useful exclusively things used in the project.