Set developed by SporyTike, guide written by benit149

Hello, and welcome to my walkthrough for Meitantei Conan: Kigantou Hihou Densetsu, or Detective Conan: Legendary Treasure of Strange Rock Island. It is the direct sequel to Meitantei Conan: Karakuri Jiin Satsujin Jiken, with the story picking up from where it left off. Thus, the gameplay is the same as before. I also wrote a walkthrough for that game as well if you would like to check it out. I will just copy and paste my gameplay mechanics explanation from there and adjust it for this installment. Since I will be making comparisons between the two games, I will refer to the previous game as Karakuri and this one as Kigantou. This guide turned out to be much harder for me to write since I didn’t find any existing step-by-step guides, so I had to watch YouTube videos. The player also did their run as Conan only, which takes a much larger number of steps to complete.

This is a visual novel where your primary protagonist is Conan Edogawa, the alternate identity of the renowned high school detective Shin’ichi Kudo who had been forced to take a drug that inadvertently shrunk him to a child. Despite this, he still manages to solve near-impossible crimes while keeping his identity secret from all except for a select few. During the game, you can swap to three other characters, each who have their own benefits and drawbacks as you progress through the story.

Ran Mouri: the main heroine of the Detective Conan franchise, she is Shin’ichi’s childhood friend who is completely oblivious to the fact that he and Conan are the same person. Ran’s biggest weakness is that she cannot think about Key Words (I’ll get to this shortly) due to her not being a detective

Kogoro Mouri: Ran’s father, and renowned as the great detective Sleeping Kogoro, but only because Conan puts him to sleep with a tranquilizer and solves the case by disguising his voice with a gadget in his bowtie. Otherwise, Kogoro tends to be inept at his job (unless he tries really hard)

Sonoko Suzuki: the biggest difference between Karakuri and Kigantou is the fourth character. Sonoko is Ran’s childhood friend and part of the Suzuki zaibatsu (“family enterprise”). Conan sometimes uses Sonoko to explain mysteries instead of Kogoro, so she has gained a small reputation as the Deduction Queen. Like Ran, she cannot consider Key Words either

To swap characters, you need to be Conan first. Go to where they’re standing and talk to them. A speech bubble with the word SWAP will show up, which you need to press the Select button. If you want to stop playing as them, you have to go back to being Conan. Ran, Kogoro and Sonoko cannot swap between each other. This game can be beaten without swapping characters, but you need to do a lot of additional steps with Conan to acquire all of the clues, which could eat up precious time for the speedrun achievement. You do need to swap to the other characters at least once to get their respective achievements however.

There are also three mainstay characters from the series who aren’t playable, but are involved with the story. They are a trio of first graders who make up the Detective Boys, with Conan inducted as another member. The wide-eyed boy is Mitsuhiko Tsuburaya, the girl with the hairband is Ayumi Yoshida, and the obese boy is Genta Kojima. They will serve an important background role in the story later on.

The other main mechanic this game has is the Key Words option in the menu. As you gather enough evidence, you will hear a chime. This means an entry has been added to the list of Key Words. In the translation for Karakuri, Ran calls this mechanic Considering. It isn’t explained in-game for Kigantou, so this should cover it. To make progress with a case, you need to analyze the Key Words as they come up, sometimes in a specific order. You can’t use Ran or Sonoko for this, so I always stuck with Conan for this job.

The storyline itself isn’t too long, but since this is a visual novel, it can get a bit wordy. Luckily, you have an option in the menu to speed up the text to a faster speed and have it auto-advance itself so you don’t have to worry about mashing. Don’t use this option on your first playthrough. Just enjoy the story and learn what the route is to prepare for the speedrun Simple Logic achievement.

I’ll omit major story details and just explain the steps you need to do to make progress. Some of these triggers are a bit vague, so I’ll provide detailed explanations when needed. The story is told through specific time intervals across a two-day period. Some of the steps are inherently spoilery, so take heed of spoilers if you intend to use this guide.

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Walkthrough

Day 1, Port

• when you finally gain control, go to the upper right corner and examine the front of a stone pillar. You’ll need to wiggle in since Conan’s hitbox is pretty large
• go up into the next screen and speak to the woman in blue on the left. This is Kaori, a freelance photographer
• go back to the port and examine the rat statue again
• consider “Statue” and “Rat”
• go back to the next screen and talk to Kogoro, who will explain the Swap mechanic. I wrote down these steps according to the video I watched, which was a Conan-only run, so swapping isn’t actually needed to clear the story. This is different from Karakuri where swapping was required a couple of times
• go back to the port and examine the rat statue for a third time
• go back to the next screen and talk to the policeman, then ask him about the island and the Shimamuras
• speak to Kogoro. Sonoko and Kyoko should return in a cutscene

Day 1, Shimamura Mansion

• MURDER!
• examine the body
• go inside the mansion and head to the fourth floor, then go into the room just below Satomi and Miki
• examine the window with the broken glass shards
• consider “Glass”
• return to the first floor

Day 2, Investigation

If you thought the investigation from Karakuri was tricky, this is significantly worse due to the larger search area and characters to talk to, requiring you to backtrack all over the place. The video I watched did all of this using only Conan, so I’m not positive on how much more effective other characters will be. One efficient way to save time is to have one of the adults examine the stone pillars, since Conan is too short to read all of them and needs to do some extra steps to have someone help him. Likewise, Conan actually has to look at two of the statues himself since the adults are too tall to read the codes closer to the ground (why they couldn't kneel down and look themselves is beyond me). As long as you know where they are, then you can omit those related steps.

• go down to the third floor and enter the library, then examine the upper right bookshelf
• go down to the second floor and through either door, then ask Satomi about Seiichi and the statue
• leave the mansion, go two screens left, then immediately go up to examine the next stone pillar
• consider “Monuments”
• examine the door of the house
• go back to the front of the Shimamura Mansion, then go down two screens and right one screen
• examine the third stone pillar
• go right another screen and speak to Kyoko
• go back to the mansion and enter to watch a cutscene, then speak to Takamura
• return to the locked house and enter, then examine the computer at the upper right
• go back to the screen with the police station, then head left two screens
• consider “Mail”
• return right one screen and examine the fourth stone pillar
• re-enter the mansion, head to the fourth floor, enter the room with the broken glass, and examine the computer
• go back to the first floor for a cutscene
• once the scene is over, speak to Takamura and ask him about the Shimamuras and about anyone suspicious
• return to the screen with the police station and ask the officer about the circumstances and the villagers
• consider "Tadao”, “Kunio” and “Kyoko”
• go left one screen, enter the house, and speak to Tadao
• return to the front of the mansion, then head up the alley at the left side of the entrance to reach the backyard where Kunio is, then talk to him
• go back to the screen where Kyoko is and talk to her
• return to the front of the mansion, then go right one screen and examine the footprints in the mud
• speak to the officer to distract him, then go to the next screen and enter the house
• examine the shoes at the entrance twice
• consider “Sneaker” and “Footprint”
• examine the footprints to the right of the door outside the second house
• consider “Footprint 2”, then “Footprint” again
• go back to the previous screen, enter the house, then examine the trousers
• return to the front of the mansion, then head up the alley at the left side of the entrance to reach the backyard where Satomi is, then talk to her
• re-enter the mansion and examine the grandfather clock that Takamura is standing next to
• go to the second floor and speak to Miki in her room
• go up to the fourth floor and reach the end of the hallway, where you’ll find a ladder
• consider “Dirt”, then return to the first floor and speak to Takamura
• return to the ladder and examine it, then go back to Takamura and talk to him
• go up the ladder to the roof, then approach above the broken window
• consider “Roof”, then “Glass”, then “Phone”, then “Mobile” in that order
• from where Satomi is, go up another screen and examine the next stone pillar
• head left, then up and speak to Kaori. Say you’ll collaborate with her, then bring her to the pillar you just examined
• go to the police station and head right once, then examine the pillar there
• return to the station and head left, down, and left, then examine the pillar at the far left
• consider “Monuments”. You need to have found six pillars and their code words to make progress with this
• go to the mansion’s dining room and a cutscene will occur
• exit the mansion, then re-enter it and the dining room, then speak to Ayumi

Reasoning

Just like in Karakuri, these are a series of questions designed to see if you’ve been paying attention to the story. Simply use these answers to make progress.

1. Cut beforehand
2. Take to rooftop
3. From the roof
4. Make a phone ring
5. Own phone call
6. Was summoned
7. Culprit
8. They were cut
9. Other person
10. Walk backwards
11. Attach mud
12. Not worn down

Resolution

• after the cutscene, go to the first floor, then keep going down towards the police station
• watch the long cutscene of Sleeping Kogoro solving the case
• select all three options
• select all three options again
• select “Vertical from UR”
• from the front of the mansion, go up the alley to the screen where Kunio and Satomi were, then go up, right, and up, then examine the monument
• examine the small waterfall at the upper left
• select “Turn on light”, then “Close window”
• after the credits are done and the cutscene finishes, go to the first floor, speak to Ran, and select “Yup, they are”

If you're going for the speedrun achievement, you need to wait for the Sleuth Score screen to appear after the credits.

With that, it’s case closed. This installment is much harder than Karakuri, but hopefully this walkthrough will help you get through it. A Conan-only run obviously isn’t efficient on time, but with the fastest text speed and knowing the layout of the island, you should be able to do it in under 75 minutes. If not, figure out some alternate strategies using the other three characters. I don’t have much else to say except my usual – happy cheevo hunting!

• Benit149, August 2025