Trace Memory

Trace Memory is the story of a girl, her newly-found amnesiac ghost friend, and the successful prediction of a DS-with-camera by three years.

Debug Menu
While there is no known way of accessing the menu, there appears to be at least remnants of one in the American and European versions (the Japanese version does not appear to contain these options, so they were likely added during localization). Starting at offset in the European version and  in the US one are a number of strings which do not appear anywhere in-game and seem to point to a hidden developer menu:

VISUAL MYSTERY Sound Test BG Check Mode Select Mystery %s Not Found Stopped With 'B' Button

The European version localizes these text strings into several languages, which were removed in the US version.

Assert Strings
Starting at offset in the Japanese version,  in the European version, and  in the US version are some assert strings from a file called isdoverlay.c. It remains unclear if all these strings are from the same file, but at least one part names a file which suggests it was used as part of the build process, sorting data between two folders on the root of the ROM's file system: "data" and "overlay".

(null) ASSERTION FAILED FILE=[%s] LINE=[%d]  EXP=[%s] WARING FILE=[%s] LINE=[%d] EXP=[%s]

isdoverlay.c pInfo->m_info[i].m_VMA <= nVMA (u64)pInfo->m_info[i].m_VMA + pInfo->m_info[i].m_SIZE > nVMA pInfo->m_info[i].m_VMA == nVMA pInfo->m_info[i + j].m_SIZE > (u32)nWrapSize pInfo->m_info[i + j].m_SIZE > 0.pInfo->m_info[i + j].m_SIZE < 0xf0000000 nIndex < pInfo->m_header.m_nInfoCount nIndex <= pInfo->m_header.m_nInfoCount

Regional Differences
In a somewhat unusual occurrence, Nintendo of Europe made the first pass at translating the game from Japanese. When they did so, the original English translation was a literal translation of the Japanese dialogue to British English (for example, "Candy" became "Sweets"). The US version rewrote a large bulk of this text, somewhat changing the attitude of the main character and adding Easter eggs that were not in the other versions.

DAS/DTS
Japan and Europe call the game Another Code: Two Memories, which changed to Trace Memory for the US version likely due to trademark disputes. Either way, this change burrowed deep into the game's writing with references to "trace" occurring where they did not in other versions.

One particular change was the renaming of the in-game Nintendo DS, which in Japan and Europe was called "DAS" or "Dual Another System". Since any trace of "Another" was purged from the game, the name changed to "DTS" or "Dual Trace System". This would cause some interesting changes in the US version:

The DAS/DTS menus were changed to remove references to "another" which wraps around a graphic seen in the background, and instead places a large "TRACE" logo above said graphic. Also pictured is a change in localization where the sentence "Dual Another System Start" changed to "Dual Trace System Start".

The inscription on the front of the DAS/DTS was also changed.