Wily Castle

Wily Castle is a stage that appears in both Super Smash Bros. for Nintendo 3DS and Super Smash Bros. for Wii U and a recurring location in the. The castle itself is based on its appearance from . While both versions are near-identical, the Nintendo 3DS version takes place during the day, while the Wii U version takes place at night. The main body of the stage is flat, with two floating platforms at either side, suspended beyond the body of the stage.

In the Wii U version of the stage rails like the ones from Mega Man 2's Crash Man stage and the fourth Wily Castle stage appears around the left platform, and the platform moves along the rail. Similar to Guts Man's stage from Mega Man, these rails have gaps in them which, when the platform crosses them, causes them to drop temporarily until it reaches a solid rail again. There may be more than one possible rail configuration.

In the Nintendo 3DS version, platforms occasionally appear above the stage that fly back up after a while. In addition, the pendulum platforms from Bright Man's stage in Mega Man 4 occasionally appear on both sides of the main platform, and move back after a while.

At random times in both versions, the Yellow Devil appears in the background, disassemble and fly up, then descend and reassemble on the stage. When the Yellow Devil is formed, it attacks the players with its own body until it is defeated by taking a sufficient amount of damage from the players, though only its eye is vulnerable. Once defeated, the Yellow Devil explodes, and this explosion counts as an attack for the player who landed the final blow.

Wily Castle reappears in Super Smash Bros. Ultimate, where hazards from both the 3DS and Wii U version make an appearance.