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Stupid G.U.N. Beetle Sentry Drones! They may be weak, but they are relentless!

Dr. Eggman, Shadow the Hedgehog

The Mono Beetle[1] (モノビートル Monobītoru?) is an enemy that appears in the Sonic the Hedgehog series. It is a mass-produced robot model deployed by Guardian Units of Nations, and a part of the Beetle Series. It is the most basic model in the Beetle series, and its design serves as the template for all other robots in its series.

As the Mono Beetles serve as little more than surveillance drones, they are rather harmless and can occasionally be used as "stepping steps" using the Homing Attack.


The original Mono Beetles basically resemble grey balls with blue outlines and armor on the front. On top of them, they have a sharp blue cap with a red-striped edge. Below this cap, reaching from just behind the edge of their front armor to far behind their back, they have a horizontal yellow turbine disk with a red and blue-striped frame. On their "face", they also have a single yellow, red and white lens. In Sonic Generations, the Mono Beetles' design was slightly tweaked, where their lenses were colored more red and white and their cap was emblazoned with GUN's symbol and the number "01".

In Shadow the Hedgehog, the Mono Beetles more closely resemble Bomb Wings. In this game, they are green instead, their dish attachments are made thicker (resembling jet engines) and they have a pair of small wings on the sides.

Game appearances

Sonic Adventure 2

A row of Mono Beetles in Metal Harbor.

The Mono Beetle first appeared in Sonic Adventure 2 and Sonic Adventure 2: Battle. In this game, the Mono Beetles are among the most common enemies encountered. Mono Beetles can be found in the following stages:

Character Stage
Sonic City Escape
Green Forest
Crazy Gadget
Metal Harbor
Tails Prison Lane
Eternal Engine
Knuckles Aquatic Mine
Shadow Radical Highway
White Jungle
Sky Rail
Dr. Eggman Iron Gate
Sand Ocean
Lost Colony
Cosmic Wall
Rouge Dry Lagoon
Security Hall

The Mono Beetle has no method of attack, unlike most other robots in the Beetle series, and will only hover around in the air. Sometimes, it might be invisible and suddenly appear when a character comes near their position. When a Mono Beetle spies the player, its "eye" will light up and it will bob up and down excitedly. Each Mono Beetle awards 100 points when destroyed.

Shadow the Hedgehog

A Mono Beetle in Shadow the Hedgehog.

In Shadow the Hedgehog, the Mono Beetles made their first return as enemies. In this game, they are a very common enemy that appears in stages where G.U.N. troops can be found, such as Westopolis.

Sonic Generations

A Monno Beetle on Radical Highway in Sonic Generations.

In the console/PC version and Nintendo 3DS version of Sonic Generations, the Mono Beetles appear as enemies. They appear in both Acts of Radical Highway on the Nintendo 3DS version and in both Acts of City Escape on the console/PC version. In gameplay, their behavior is the same as it was in Sonic Adventure 2.


The Shadow and Mono Beetle figures by Jazwares. Note the year displayed on the package.

This robot was included as a bonus figure with a Shadow figure from Jazwares for the "Sonic through Time" line. On the box however, it reads "2000", which it should be 2001 as it is the year Sonic Adventure 2 was first released. As of 2012, the displayed year still has not been changed despite the fact that Jazwares added a new sticker in place of the 20th anniversary logo.



Concept artwork


  1. Prima Development (20 June 2001). "Enemies" (in English). Sonic Adventure 2: Prima's Official Strategy Guide. Prima Games. p. 16. ISBN 978-0761536147.

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