Orbinaut

Two types of orbinaut from Sonic 1.

Orbinaut is a badnik that appears in more than one game. It's a hovering sphere surrounded by four spiked balls which rotate slowly and are used for both attack and defence, and is apparently based on a sea urchin (the Japanese word for sea urchin is "uni"). A redesigned Orbinaut appears in the 3D games, where it is called E-32 Unidus.

Sonic the Hedgehog

In the Mega Drive version of Sonic the Hedgehog, there are two types of orbinaut. The first appears in Labyrinth Zone, and is referred to as "Unidus" (ウニダス) in the Japanese manual. "Unidus" is red in colour and launches its spikeballs along a horizontal line when Sonic approaches. The second type is found in Star Light Zone, and is known as "Uni-uni" (ウニウニ) in the Japanese manual. It is green in colour and doesn't launch its spikeballs, making it less threatening but harder to kill. An orange "Uni-uni" also appears in the 8-bit version of Sonic the Hedgehog in Sky Base Zone.

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  Uni-uni in Sonic the Hedgehog (16-bit)

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  Unidus in Sonic the Hedgehog (16-bit)

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  Unidus in Sonic the Hedgehog (8-bit)

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  Uni-uni in Sonic the Hedgehog (8-bit)

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  Orbinaut in Sonic the Hedgehog 4

Technical Information

Game	Object ID #	Code offset	Mappings offset	Compressed art offset	Subparameters
Sonic the Hedgehog (16-bit)	$60	$11CCE	$11EEC	$389EE (Nemesis Format, 31 blocks)	$00 - Attacking type $02 - Nonattacking type
Sonic the Hedgehog (8-bit)	$35

Sonic the Hedgehog 3

An Orbinaut in Launch Base Zone.

A third Orbinaut appears in Sonic the Hedgehog 3's Launch Base Zone and is referenced as Pola (ポーラ) in the Japanese manual. This version is silver-grey and spins faster when Sonic is moving, but doesn't launch its spikeballs. It is similar to Uni-Uni in this regard.

A similar enemy in IceCap Zone, Star Pointer, does launch its spikeballs, like Unidus, so both types of Orbinaut are covered in Sonic 3.

Sonic the Hedgehog 4

Both types return in Sonic the Hedgehog 4. They are the same as in Sonic the Hedgehog, down to the color.

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