Editing Ultimate Castle Challenge

{{level infobox
|code=Extra 6
|image=[[File:Castles_-_Masterpiece_Set.png|240px]]
|game=''[[Super Mario World 2: Yoshi's Island]]'', ''[[Yoshi's Island: Super Mario Advance 3]]''
|before=[[King Bowser's Castle (Super Mario World 2: Yoshi's Island)|<<]]
|after=>>
|track=Castle & Fortress<br>Athletic<br>Powerful Baby
|sample=Castle & Fortress<br>[[File:SMW2YI Castle and Fortress.oga]]<br>Athletic<br>[[File:SMW2YI Athletic.oga]]<br>Powerful Baby<br>[[File:SMW2YI Powerful Infant.oga]]
}}
'''Castles - Masterpiece Set''', renamed '''Ultimate Castle Challenge''' in the GBA remake, is the Extra Stage of [[World 6 (Super Mario World 2: Yoshi's Island)|World 6]] in ''[[Super Mario World 2: Yoshi's Island]]'' and ''[[Yoshi's Island: Super Mario Advance 3]]''. Like every other Extra Stage, this level's playable [[Yoshi (species)|Yoshi]] is the [[Yoshi|green Yoshi]].

==Level areas==
*Part 1: [[Caged Ghost]]s and a [[Mace Guy]] are present.
*Part 2: Moving platforms over and under [[Spike Trap|spike]]s and [[thorn]]s are present. Some [[Spear Guy]]s appear here.
*Part 3: [[Flatbed Ferry|Flatbed Ferries]] under and over thorns, super-fast platforms that head straight into spikes. An [[Egg Block]] appears in this room, as well as some [[Dangling Ghost]]s.
*Part 4: The player rides on a flatbed ferry and avoid being knocked by [[Slugger]]s and [[Green Glove]]s.
*Part 5: The player ground-pounds through a long tunnel and avoid being knocked into thorns lining the walls.
*Part 6: It is similar to Part 5, but with thorns absent.
*Part 7: The player rides an underwater flatbed ferry going under thorns, and the player reaches the [[Goal Ring]] for the final part.

==Background music==
*Parts 1-3: Fort/Castle
*Parts 4-6: Athletic
*Part 7: Bonus Area

==Enemies==
<gallery>
SMW2YI - Mace Guy.png|[[Mace Guy]]
SMW2 Caged Ghost tunnel blue.png|[[Caged Ghost]] (tunnel, blue)
Caged ghost.PNG|Caged Ghost (square, blue)
SMW2 Woozy Guy green.png|[[Woozy Guy]] (green)
SMW2YI Green Shy Guy.png|[[Shy Guy|Shy-Guy]] (green)
SMW2YI Red Shy Guy.png|Shy-Guy (red)
SMW2YI Yellow Shy Guy.png|Shy-Guy (yellow)
SMW2 DSGuy.png|[[Dancing Spear Guy]]
SMW2 Thorn.png|[[Thorn]]
Dangling ghost.PNG|[[Dangling Ghost]]
SMW2YI - Green Glove.png|[[Green Glove]]
SMW2 Grunt walk.png|[[Grunt (Yoshi's Island series)|Grunt]] (walking)
</gallery>

==Gallery==
<gallery>
Icon SMW2-YI - Ultimate Castle Challenge.png|Level icon from ''Super Mario World 2: Yoshi's Island''
SMA3-UltimateCastleChallenge-Icon.png|Level icon from ''Yoshi's Island: Super Mario Advance 3''
</gallery>

==Names in other languages==
{{foreign names
|Jap=おしろ　けっさくしゅう？
|JapR=O-Shiro Kessaku Shū?
|JapM=Castle Masterpiece Collection?
|Chi=挑战城堡
|ChiR=Tiǎozhàn Chéngbǎo
|ChiM=Challenge Castle
|Spa=Castillo de castillos
|SpaM=Castle of castles
|Ger=Spezial Total
|GerM=Special Total (literally)
|Ita=Castello tranello!
|ItaM=Trap castle!
|Fre=La Compile !
|FreM=The Compilation!
}}

==Trivia==
*In the second area of this level, the tracks that the Flatbed Ferries travel on spell the word "YOSHI" in worldwide releases, but in Japanese versions, they instead spell "YOSSY" (an alternate romanization also used for the box art). This was also the case for the remake.

{{YI levels}}
[[Category:Castles]]
[[Category:Secret levels]]
[[Category:Super Mario World 2: Yoshi's Island levels]]
[[Category:Yoshi's Island: Super Mario Advance 3 levels]]