For the Make a Good 24 Hour Mega Man Level location, see Wily Fortress.
Wily Castle is a location in the original Make a Good Mega Man Level. It is, as its name implies, Dr. Wily's castle, and contains the six endgame Wily stages, all of which are made by the contest judges. It is unlocked by getting all 24 Energy Elements from the five Tiers and their tier bosses, and then using a teleporter installed into Dr. Light's Lab1/riding a space elevator outside the lab1R. Unlike the entry stages, the Wily Castle's stages are played in succession, in the order shown below. If Mega Man loses all of his lives, he will be sent back to the start of the level he was on.1 The castle does not need to be cleared in a single run; if the player quits the game and reloads while in the Wily Castle, they will be taken to the last level they reached, rather than returning to the first stage or the main hub.
In Make a Good Mega Man Level Remastered, all the Wily Castle stages are completely redesigned by their original creators (with two exceptions). After beating the game, the Wily stages can be freely replayed by talking to Dr. Light. Hidden in every level is an unnamed floppy disk collectible; collecting one will unlock the old version of that disk's Wily stage from the original game, though the redesigned bosses replace the original bosses.
The Wily Castle makes a brief appearance in Make a Good Mega Man Level: Episode Zero's prologue, with the first level taking place just before/right after the original MaGMML's final boss fight.