The Metroid Detector (also referred to as the Metroid meter in some print) is a technology exclusive to Metroid II: Return of Samus. It appears as a small Metroid in the bottom right corner of the screen, and is used to detect the number of Metroids remaining on planet SR388. Whenever Samus Aran kills one, be it an Alpha, Gamma, Zeta or Omega, the meter will scramble for a few seconds before it decreases the number by one. If the game is paused, the tiny Metroid will be replaced with an "L", indicating how many Metroids are left in the area.
By default, the number is thirty-nine Metroids, however, when Samus is approaching the Queen Metroid, crossing the first scene with the Metroid Egg in Phase 9, the meter raises up to nine, indicating the eight mature Metroids. Although Samus may return after escaping the battle with the Queen, the eight Metroids will not respawn.
In Metroid: Samus Returns, the remake of Metroid II, the Detector is now called the Metroid Radar. When a Metroid is nearby, it will begin beeping with its frequency depending on how close Samus is to the Metroid. This is similar to the Motion Trackers used by characters in the Alien films to track the movements of the titular creatures. The Metroid Radar is further enhanced by the Metroid Marker, which is usable if the Metroid amiibo has been scanned. Chozo Seals also indicate the number of Metroids in their given area, as well as the location of their husks.
When the baby is born, the meter does not rise up to one. This implies that the Metroid Detector does not take into account Infant Metroids until they grow to the Larva Metroids more commonly seen in other games. As this occurs in both Metroid II and Samus Returns, it is likely due to the hatchling's inhostility and not a technical error. Discounting the hatchling, the meter totals 47 Metroids throughout the game.
Metroid II manualEdit
- The number of Metroids detected on the planet.
- This detector can also show other information about Metroids.
Metroid.com (Samus Returns)Edit
- Metroid Radar
- "A convenient tracker located on the bottom of your map that lets you know if there’s a Metroid near you, and how many you have left to kill."
Metroid: Samus Returns manualEdit
- Metroid Radar
- "Displays the number of Metroids on the planet. A reaction occurs when a Metroid is nearby."