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only in Japan.
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"Eureka!" is an interjection used by Miles Edgeworth in Ace Attorney Investigations: Miles Edgeworth and Gyakuten Kenji 2 when he works out a clue at a crime scene. His father, Gregory Edgeworth, also used it for the same reasons.
Hershel Layton uses it in place of "Take that!" when presenting evidence in the Japanese version of Professor Layton vs. Phoenix Wright: Ace Attorney. In the localized versions, he instead shouts "Have a look!"
- "Eureka!" only has voice acting and speech bubbles for Japanese and English. This is due to Ace Attorney Investigations: Miles Edgeworth not being localized in any other language, unlike previous Ace Attorney games, and only the Japanese version of Professor Layton vs. Phoenix Wright: Ace Attorney using the interjection.
Eureka is an interjection used to celebrate a discovery, a transliteration of a word most famously attributed to the Greek scientist Archimedes. The word comes from the Ancient Greek word "heúrēka" (εὕρηκα), meaning "I have found (it)".