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{{Stage order
|previous = Neo Green Hill Zone
|game = Sonic Advance
|current = Secret Base Zone
|next = Casino Paradise Zone
|stage = Zone
}}
{{Infobox level
|width       = 
|title       = Secret Base Zone
|image       = [[File:SBZ.png|242px]]
|caption     = Tails in Secret Base Zone.
|1st_app     = ''[[Sonic Advance]]''
|other_apps  = ''[[Sonic Pinball Party]]''
|game        = 
|description = Typical factory-city installation.
|theme       = 
*[[Fire theme]]
*[[Industrial theme]]  
|location    = [[Eggman Empire]]
|previous    = [[Neo Green Hill Zone]]
|next        = [[Casino Paradise Zone]]
|charas      = 
*[[Sonic the Hedgehog]]
*[[Miles "Tails" Prower]]
*[[Knuckles the Echidna]]
*[[Amy Rose]]
|number      = 2
|acts        = 2
|enemies     = 
|sub-boss    = 
|boss        = 
}}
{{nihongo|'''Secret Base Zone'''|シークレットベースゾーン|Shīkurettobēsuzōn}} is the second [[Zone]] of ''[[Sonic Advance]]'' for the [[Game Boy Advance]].

==Description==
A typical factory-city installation of the [[Eggman Empire]], this [[Industrial theme|industrial]] setting features a host of manufacturing-based obstacles: swinging hooks to leap across the ceiling, pressurized tubes to sweep the player through a pipe network, steam tops, [[Fire theme|lava crucibles]], and free-floating iron platforms. Less-usual gimmicks include zip-lines crisscrossing the foreground, and dual chutes that drop the player through the background. Many of the features in this level first debuted in [[Metropolis Zone (Sonic 2)|Metropolis Zone]] from ''[[Sonic the Hedgehog 2]]''.

A unique effect in the very first, outdoor part of Act 1 is an interesting floodlight motif, later used in ''[[Sonic Advance 2]]'''s [[Ice Paradise Zone]]. At the end of act 2, [[Sonic the Hedgehog|Sonic]] battles [[Doctor Eggman|Eggman]] in the [[Egg Press]], the [[Egg Mobile]] with a pogo-spring attached below it. It will bounce around trying to hit the player until it is almost defeated. Then it will jump off-screen at a very high altitude and will land at the player. If the player dodges it, he/she must also jump to avoid taking damage from the shaking ground the impact of the landing causes. It will then bounce around again and off screen every once in a while until defeated.

The boss is similar to the [[Hopping Egg Vulcan]] from [[Sleeping Egg Zone]] in ''[[Sonic Chaos]]''.

==Gallery==
{{Gallery start}}
<gallery>
Secret Base II.png
Secret Base I.png
Secret Base III.png
Secret Base IV.png
Secret Base IX.png
Secret Base V.png
Secret Base VI.png
Secret Base VII.png
Secret Base VIII.png
Secret Base X.png
Secret Base XI.png
</gallery>
{{Gallery end}}

==Music==
{{#tag:tabber|
Act 1=
[[File:Sonic Advance Music Secret Base Zone Act 1|350px|left]]
{{!}}-{{!}}
Act 2=
[[File:Sonic Advance Music Secret Base Zone Act 2|350px|left]]
{{!}}-{{!}}
}}
{{-}}

==Video==
[[File:Sonic Advance (GBA) Hidden Base Zone|thumb|350px|left]]
{{Advance info}}
[[Category:Sonic Advance zones]]
[[Category:Eggman's bases]]