Editing NDDEMO

|release=2001

|format={{format|gcn=1}}

'''''NDDEMO'''''<ref>{{cite|url=imgur.com/a/QJ9HMUR|title=Nintendo GameCube SDK documentation}}</ref> (short for "'''''Nintendo Developer Demo'''''"; referred to in-game as '''''Welcome to GameCube World!!''''') is a 2001 interactive [[tech demo]]<ref>{{cite|language=en|author=monokoma|date=March 1, 2009|url=www.unseen64.net/2009/03/01/peachs-castle-gamecube-tech-demo|title= Peach’s Castle (GameCube – Tech Demo)|publisher=Unseen64|accessdate=June 5, 2024}}</ref> included in the software development kit for the [[Nintendo GameCube]], created to show developers the system's graphical capabilities. In the demo, the player controls a red arrow that can navigate various rooms in [[Peach's Castle]] from ''[[Super Mario 64]]'', with each room demonstrating a different graphical effect, such as bump mapping, anti-aliasing, or environment mapping.

This is the main hub area featuring six doors, five of which lead to other rooms. This room features several animated objects throughout, as well as a map of the Castle at the center of the bottom floor.

This is a small room with floral and mountain-themed murals on the walls. The floor has a [[Super Star]] with a flower in the background, which is revealed to be made of a small repeating texture of three stars when looked at closely.  

This is a dimly lit area with a colored stone pillar and spiral staircase in the center. Once the player reaches the stairs, the red arrow begins bouncing, and the player can lead it to the bottom of the room, where a door leading to the Hangar can be found.  

This is an indoor hangar with a biplane. Next to it, the player can find a metal [[Warp Pipe]], which leads to the Cave. This room demonstrates the GameCube's {{wp|Anti-aliasing filter|anti-aliasing}} functionality, most prominently with the wire-mesh fences.

This is a cave featuring a wooden bridge that leads to a [[Goomba]] statue, with some bulbs and colored projector lights illuminating the path. This room demonstrates the GameCube's real-time lighting capabilities, with lights and casted shadows updating to reflect their source's position.  

This is a small screening room where a short looping video (featuring prototype GameCube consoles of various colors), along with a blue star and pink heart, is projected and moved around the room.  

This is a small room featuring a large [[Metal Mario]] statue that reflects its surroundings, meant to demonstrate {{wp|Reflection mapping|environment mapping}}.

This is a white room with a [[? Block]] at the center. Pressing {{button|gcn|A}} while underneath releases a large number of differently colored [[Coin]]s and stars. This room demonstrates the large number of polygons, models, and objects that the GameCube can process and display at once.

The player can use {{button|gcn|Pad}} to adjust how many Coins appear when the ? Block is hit, up to 1,024 at once; {{button|gcn|Padup}} and {{button|gcn|Paddown}} increase and decrease the number by 20, while {{button|gcn|Padright}} and {{button|gcn|Padleft}} increase and decrease the number by one. The exact number can be viewed by enabling "System Info" in the pause menu.

By pressing {{button|gcn|B}}, the player can freely control the camera's angle and position. {{button|gcn|Stick}} adjusts the camera's position, and {{button|gcn|C}} controls its angle; pressing {{button|gcn|L}} or {{button|gcn|R}} raises and lowers it, respectively. Pressing {{button|gcn|B}} again returns to the arrow.

When the player reaches a door, the arrow "knocks" on the door until the corresponding room is finished loading. To reduce load times, the room the player is meant to enter next is loaded ahead of time, indicated by the star on the door being yellow instead of stone-gray.

*{{button|gcn|A}} – Jump in How Many Coins?, pause/resume in Auto Demo

*{{button|gcn|B}} – Enter camera control mode, exit room in How Many Coins?

*{{button|gcn|X}} – Enter camera control mode in How Many Coins?, slowly advance scene when paused in Auto Demo

*{{button|gcn|Y}} – Enter wireframe mode, slowly rewind scene when paused in Auto Demo

*{{button|gcn|L}} – Raise the camera in camera control mode, rewind in Auto Demo

*{{button|gcn|R}} – Reset the camera behind the player, lower the camera in camera control mode, fast-forward in Auto Demo

*{{button|gcn|Start}} – Enter pause menu

*{{button|gcn|Stick}} – Move the arrow, adjust the camera's position in camera control mode

*{{button|gcn|C}} – Rotate the camera around the player, adjust the camera's angle in camera control mode

*{{button|gcn|Pad}} – Adjust how many Coins appear when the ? Block is hit in How Many Coins?

===Sprites and models===

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*[https://www.youtube.com/watch?v=nQLauxlFYwg Gameplay footage]