Secret Files, known as Secret Memos in the European version, are a type of data file found in Pikmin 3. Unlike most data files, these do not give any direct tips or information. Instead, they simply have a picture of some Pikmin with a random number from 0 to 9.
If a player collects all ten of these memos, the numbers they contain, in order, will form a secret code. Once they are all collected, the player can then go to a Wii U exclusive website, http://www.nintendo.co.jp/pikpiksecret using the Wii U's Internet Browser, and enter their code to watch one of five secret video exploration logs. Although there are five videos, a sixth one exists, but is not accessible through normal means.
Each code is pre-written, and corresponds to a specific video. If the player wishes to see a different video, they must restart their save file from day 1 and obtain a different combination. Each language has its own codes, which can be seen by changing languages in the console's system settings. Finally, each language's code list is unique (i.e. there is no pattern to convert codes from one language to another).
These data files are not found in Pikmin 3 Deluxe, and the majority of their file locations within the game were replaced by a new set of data files called Olimar's Log Vol. 2. The videos are incorporated into the game itself, playing before and after the stages of Olimar's Assignment.
Data file locations
There are two Secret Files per area. They are normally found in spots that are hard to find or access, but a few them can be found in relatively easy locations. They are always found in the same place, but the numbers in them depend on the code generated for that playthrough.
Garden of Hope
The following is a list of known codes, for each video, and for each language.
The videos resemble major cutscenes from the game, including the characters talking, and English subtitles appearing on the bottom. Each one is a video log with Captain Olimar or Louie commenting about their expedition, and takes place in a different area.
Garden of Hope
This video occurs on the Garden of Hope. Captain Olimar mentions the company's debt, in it. The video lasts for 40 seconds.
This video is on the Distant Tundra, and in it, Olimar talks about how his company had to cut some costs. The video is 56 seconds long.
The video takes place in the Formidable Oak, and in it, Olimar talks about the golden object he saw – the Plasm Wraith – and about how Louie was reluctant to go on the oak. The video is 38 seconds long.
This log is not yet accessible via any Secret File code in the overseas version of the games, and has not been officially released by Nintendo. It was found on the website by analyzing the page's source code. In it, Louie explains how he got captured by the Koppai explorers, but managed to sneak off with their fruit. The video is 37 seconds long.
A few mistakes exist within these videos.
On the subtitles, the S.S. Dolphin is spelled like that on all but two of the videos, which have the spelling "SS Dolphin". This is the spelling used in the European version of Pikmin 3, but not anywhere else. Whether the intended spelling is with the periods or without is debatable, but the fact that the writing differs between videos seems to be the result of some mistake.
More importantly, Louie says that he is a crew member on the S.S. Dolphin, on his log. This cannot be true, as the only time the Dolphin is usable is before Louie even joins Hocotate Freight – at the start of Pikmin 2, the S.S. Dolphin is sold right away, and all through Pikmin 2 and Pikmin 3, the Hocotate ship is used instead. It even becomes clear that the Hocotate ship was the one used in Pikmin 3 because it can be seen, totaled, on the outer rim of the Quaggled Mireclops's arena. Although it's a possibility that both Olimar and Louie were talking about the Hocotate ship whenever they mentioned the S.S. Dolphin, given that in Japanese the Hocotate ship is also called Dolphin, but it's the first model, as explained here. It makes more sense to assume that they are talking about the Dolphin they are currently piloting rather than the Dolphin that was sold and is currently unavailable.
It's important to note, however, that throughout Pikmin 2 Olimar called the Hocotate ship by its full name and in Pikmin 3, in Olimar's first log entry from the Japanese version, he refers to the Hocotate ship by its full name (S.S. Dolphin first model/Dolphin 1) rather than just "S.S. Dolphin". It's possible that after writing this first log entry, Olimar started calling the Hocotate ship (S.S. Dolphin first model) simply S.S. Dolphin since it's easier to say. This would also explain why Louie calls himself "crew member of the S.S. Dolphin" and not "crew member of the Hocotate ship". If this is the case then this mistake would be wrong by the way it was localized and not because Louie supposedly mentions the original S.S. Dolphin, given the possibility that he was in fact talking about the Hocotate ship.
Olimar looking at Louie
Although unimportant in nature, there are some mistakes involving the way Olimar looks towards Louie on the first four videos. In them, Olimar always looks to his left to see Louie in some dangerous situation. Given the points where Olimar and Louie are, it is actually physically impossible for Olimar to see Louie at his left, on some of the scenarios.