User blog:Wayld02/Medium, Hard, and Very Hard Demon Levels

So, you want a much more challenging levels??? Here is the list of the most notable and well-known demon levels that are considered as medium, hard, or very hard demon levels. Will be continued...
 * Insert Coin by Etzer
 * Center of Existence by DaddePro
 * Nine Circles by Zobros
 * Theory of FirePower by TheRealDorami
 * Nitronic Freedom by Rek3dge
 * Nitroman Adventures by Rek3dge
 * Crystal of Miracle by WOOGI1411
 * Nitro Clubstep by Rek3dge
 * FuryStep by ZenthicAlpha
 * FuryFunk by ZenthicAlpha
 * FuryDynamix by ZenthicAlpha
 * Ditched Machine by Jeyzor
 * Dark Disco by Jeyzor
 * Doramis Processing by Dorami
 * ClubStep Nightmares by Zobros
 * Swing Squad by Zobros, Giron David, Orion, and Havok
 * Forsaken Neon by Zobros and TriAxis
 * Headrush by ToxicGD
 * Classic by ComplexX
 * Silhouette by Havok
 * Rainbow Dust v2 by Tygrysek
 * Fairydust by SuperPizzaLuigi
 * Jawbreaker by ZenthicAlpha
 * Jawbreaker by Viprin and TriAxis
 * UltraViolet by Viprin and more
 * LightWave by Splenetic
 * Ultimate Demon Mix by Zobros
 * Party Terror by Rob Buck
 * Infrared by Giron David and more
 * Overpowered by T3mpl4te
 * Supersonic by ZenthicAlpha and more
 * Classical by Darkz
 * 10 by T3mpl4te
 * Evil by Deay
 * The Bridge by T3mpl4te
 * Parallel Run by Dhafin
 * Screamroom by GDZober
 * Laser Box by Pennutoh
 * Classical by RayOriens
 * Ultra Fairydust by Rulas
 * Cosmonaut 21 by Pennutoh
 * Ultra Circles by Rulas
 * Escape the Core by Pennutoh and xCarbon87
 * Aurora by T3mpl4te
 * Efetis Belis by Pennutoh
 * PainStep by Pennutoh