The Great Castle Adventure
Parent game
Super Mario Bros. X is a Mario fangame that blends elements from Super Mario 1, 2, 3 and World. It has many power ups, such as the Ice Flower, Hammer Suit, Tanooki Suit, Kuribo's shoe, The Billy Gun, and Yoshi. You can also play the game with a friend in the 2 player co-op mode, where the screen seamlessly splits and combines as the players separate and rejoin. This fangame is most notable for its extensive level editor that allows you to create almost any kind of level that you can imagine. The game and engine were supported by the original creator until 2011.
Could be interesting
A fangame based around the scrapped concepts of Sonic 1, combining some elements from the early prototypes.
Sonic Color Cursed is a 2D speed based platformer, inspired by the Genesis classics with a 1-bit artstyle! Dr. Eggman is up to his antics again and this time he’s stolen all the color from the planet! Sonic and friends will have to put an end to Eggman’s plans with flying colors! Or else the world will forever cease to have color! There are RGB scales for you to adjust to have your own shade of the game. You can also enable colored outlines for important objects!