WarioWare is a series of video games within the Wario franchise and, by extension, the overall Mario franchise. It centers around Wario and his company, WarioWare, Inc., which creates very short minigames called microgames. Each employee has their own set of microgames, and two of the characters, 9-Volt and 18-Volt, have microgames themed after older Nintendo games, including those within the Metroid franchise.
References in the WarioWare series
WarioWare, Inc.: Mega Microgame$! / WarioWare, Inc.: Mega Party Game$!
In WarioWare, Inc.: Mega Microgame$! and WarioWare, Inc.: Mega Party Game$!, there is a microgame titled Metroid, which is based on the first Metroid game. It re-enacts the fight between Samus and Mother Brain in the first game, and the goal is for Samus to defeat Mother Brain by shooting missiles at her.
In WarioWare: Twisted!, there are two microgames based on the first Metroid, a souvenir, and a record of the Metroid ending theme.
The first microgame, titled Metroid-Morph Ball, sets Samus in Brinstar, with the objective of rolling in Morph Ball to a Missile Tank. At the start of the game, Samus will enter her Morph Ball and tilting the game console will alter the gravity of the stage, as if it were being turned. Pressing the "A" button will activate the Spring Ball, an ability that was not present in Metroid.
The second microgame is Metroid-Samus, and the goal is for Samus to shoot an enemy using her enlarged Arm Cannon.
There is a souvenir consisting of a playable minigame called Mewtroid. In it, a cat takes the role of Samus, and has to use the Paw Cannon (a parody of the Arm Cannon) to blast insects while rolling around on the floor.
In WarioWare: Touched!, there is a Metroid microgame featured in releases outside of Japan that replaces the microgame Famicom Tantei Club 2, likely because it is based on the Japan-exclusive title Famicom Tantei Club Part II: Ushiro ni Tatsu Shōjo. Samus's helmet still makes a cameo in the Famicom Tantei Club 2 microgame, in one of the random spot-the-difference pictures, in which it is featured on a shelf as the difference for that picture.
WarioWare: Smooth Moves
In WarioWare: Smooth Moves, there is a microgame titled Metroid Prime 2, which is specifically based on Metroid Prime 2: Echoes. Two other microgames that feature Metroid elements but are not centered around a Metroid game or the franchise. One of them is Opening Night, which features Samus in the third-level difficulty setting, playing the bass like her cameo in Tetris for the Nintendo Entertainment System. The other one is Super Nostalgic Entertainment System, in which the goal is to insert a random Super Nintendo Entertainment System cartridge into the system, one of them being Super Metroid.
If there is save data for WarioWare: Smooth Moves on the player's Wii, Wario's face appears as one of the Ship Bumper Stickers on Samus's Gunship in Metroid Prime 3: Corruption and Metroid Prime: Trilogy.
In WarioWare: D.I.Y., 9-Volt has his own Metroid microgame that features graphics based on Metroid: Zero Mission. There is also a downloadable Metroid microgame titled Metroid that was created by Yoshio Sakamoto, and it is the first microgame within the Big Name Games category to have been made available online.
Aside from microgames, there is a Morph Ball stamp from Metroid in the game creation menu. There are also two Metroid-themed records under 9-Volt's category:
|Title||In-game description||Length||Additional notes|
|Metroid||"Techno remix, yay! Pretty sweet, huh?"||1:17||An arrangement combining Title (Metroid), Brinstar (Metroid), and Samus Victory!|
|S. Metroid||"A Super Metroid metal arrangement!"||0:51||A metal arrangement of the Theme of Super Metroid|
WarioWare: D.I.Y. Showcase
In WarioWare: D.I.Y. Showcase, in 18-Volt's set, 9-Volt appears in a ship that resembling his hat, possibly based on the Gunship. Like in WarioWare: D.I.Y., Sakamoto's Metroid microgame is a downloadable microgame.
In WarioWare Gold, there are two returning microgames from WarioWare: Twisted!, Metroid-Morph Ball (which has been retitled Metroid) and Metroid-Samus. The latter minigame has been updated with graphics, music, and sound from Super Metroid. There is also a souvenir titled Mewtroid 2: Return of Sameow, which is a sequel to the Mewtroid souvenir from WarioWare: Twisted!.
If the player scans an amiibo, including of Samus, Zero Suit Samus, or a Metroid, Wario sketches a crude drawing of that character.
WarioWare: Get it Together!
In WarioWare: Get it Together!, there is a microgame titled Super Metroid, which is based on the Super Nintendo Entertainment System game of the same name.
References to the WarioWare series
The Japanese strategy guide for Metroid: Other M includes the Metroid and Metroid Prime 2 microgames from Mega Microgame$!, Mega Party Game$! and Smooth Moves on page 174, which summarizes cameos Metroid has made in other series.
WarioWare: Touched! screenshot of Famicom Tantei Club 2, featuring Samus's helmet on the lower screen
WarioWare: Smooth Moves screenshot of Opening Night in the third difficulty setting, with Samus playing the bass at the top-right
WarioWare: Smooth Moves screenshot of a Super Metroid cartridge in Super Nostalgic Entertainment System