MathAqua TussSeaDoku

The cache is NOT at the posted coords!

• There are 6 stages to finding one set of coordinates [Oh! Yes! 6 stages!]. Well, if we can have multis with waypoints across international borders, then what’s a 6 stage puzzle that you have to solve sitting at home? :P
• Final coords: South 33 52.ABC East 151 12.DEF 
• All the letters are unique puzzles. 
• Logging Etiquette: Geocache hiders sometimes go through a great deal of planning to place their caches. As a result, they'd like to hear your feedback on whether you liked or disliked any aspect of the hide, or if you feel that some cache maintenance is required. Single word, acronym, or emoticon logs may be easier when you have a lot of caches to log, but it doesn't tell the hider, or other finders, anything about your adventure (or lack thereof) in finding the cache. Please keep this in mind when entering your log.
• About the cache: Please be careful while retrieveing it. Do Not Allow children to retrieve the cache. Located in a high muggle activity area, please use stealth (especially on weekends). Kindly replace the cache as found. During daytime, if you sat at gz, you would be able to see some jellyfish.
• If you enjoyed finding the cache, please feel free to give a favourite point to the cache
• BYOP
• Congratulations!!! FTF: Kid Ron Satan. 2TF: Equipe des fous.
• BONUS Cache: MathAqua Lakeudo 

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A: Sudoku