Peach's Castle (ピーチ城上空, Above Peach Castle) from Super Mario 64 is Mario & Luigi's home stage in Super Smash Bros. In 1P Game, the player fights a team consisting of Mario and Luigi on this stage. Luigi is also fought here in his unlocking battle in the same game.
Even though this stage did not return in Super Smash Bros. Melee, a portion of the music that plays on it plays during the cutscene where Luigi takes Mario's place in Melee's Adventure Mode. Additionally, a similar stage called Princess Peach's Castle was a playable stage in Melee.
Peach's Castle returned as downloadable content in both versions of Super Smash Bros. 4 on July 31st, 2015, alongside Hyrule Castle. Like other returning stages from the first Smash game, some of the textures are slightly higher in quality, but the general overall primitive look of the original is retained. Peach's Castle also returns as a familiar stage in Super Smash Bros. Ultimate.
Peach's Castle has two main platforms, one on top of another. It is possible to fall through the top platform. The bottom platform partially makes a block going left to right, that makes a sound in Smash 4 if listened to carefully. On the top two corners, there are two floating, inward-angled platforms that move slowly up and down and prevent people from being smashed away too easily. These platforms are very easy to DI off of as well. It has a floating Bumper on the middle above the second platform of the stage. This bumper moves slightly left and right (it remains stationary on 1P Mode though). It is difficult for most characters to recover on this stage since the two floating platforms limit recovery to the top platform and there are no ledges that can be grabbed, with the moving black platform on the bottom of the stage greatly aiding recovery, but it isn't always on the side the player is on). In Smash 4 however, fighters can now grab onto the bottom platforms.
Ω forms and Battlefield form
In Super Smash Bros. 4, the Ω form removes all features but the main platform, which is extended and flattened.
In Super Smash Bros. Ultimate, the main platform of the Ω form and Battlefield form is similar to SSB4's Ω form; however, it is resized and reshaped to match Final Destination and Battlefield, respectively. The design of the three soft platforms of the Battlefield form is based on the wooden soft platform in the center of the regular form.
In Ultimate, with hazards off, the Bumper is not present, the angled platforms do not move, and the bottom platform doesn't shift and is completely centered.
This stage is loosely based on various elements of Princess Peach's Castle from Super Mario 64, along with other elements from the game, such as the bridges (which resemble the broken bridges in Cool, Cool, Mountain), and the design of the triangular platforms in the upper corners (which resemble the starting platform of Bowser in the Dark World). An aerial view of Princess Peach's Castle can be seen in the background, and in SSB, Lakitu will occasionally appear.
In Smash 64, for a long period according to the old American ruleset, Peach's Castle was usually considered a counterpick stage in singles. This is because of the inability to grab the edges, meaning that some characters can be gimped or edgeguarded much easier than usual, and because of the Bumper hazard and angled platforms on the side of the stage that can prevent KO moves that would have otherwise KO'd. However, the Bumper can be used for various unique combos, and can also be used by characters such as Pikachu to escape pressure. The stage is often counterpicked by Jigglypuff and Kirby players and the lack of edges that can be grabbed serves as a disadvantage to characters such as Link and Captain Falcon. However, most recently the stage was banned. In doubles tournaments, the stage is usually banned, due to the listed reasons above along with the fact that the stage is too small.