Below is a guide for Trainwreck's first investigation room, the connecting car! 

If you're having a hard time solving the puzzles and don't think you can work them out by yourself, use this guide as a last-ditch effort to make it through!

SPOILERS BELOW! If you'd still like to try to complete the puzzles yourself, don't scroll down!

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And so your investigation begins!

Welcome to the connecting car!

From the start, you have access to two rooms: the main room and the bathroom. Before exploring around, talk to Ethan and Ikuro.

 Ethan will point you in the direction of the bathroom. That's this door right here! Head inside.

Once inside the bathroom, interacting with the sink allows you to pick up the [RED KEY].

With the key equipped, Ethan and Ikuro have some new things to say. Chat with them before continuing.

Once you're done chatting, equip the [RED KEY] and open the red box inside the bathroom.

With the box now open, more of the room is available to you. Before you can explore it however, a mandatory chat with Ethan pops up. Click his icon from the party menu to talk to him.

Once you're done talking, you now have a few more doors you can open. Re-equip your L-Gear and interact with this door first.

Once inside, interact with these papers to acquire {BOOKMARK FRONT} and {BOOKMARK BACK}. Head back outside.

With either one of these equipped, you can have a new interaction with Ethan and Ikuro. Talk to them both before continuing.

Next, with your L-Gear equipped, enter the door on the right.

Inside the closet, there is a wicker basket. Interact with it to get the [ENNEAGRAM BOOK].

Next, with the [ENNEAGRAM BOOK] equipped, talk to Ethan.

Once you've finished that conversation, re-equip your L-Gear and interact with this door.

There is an odd box resting in here. There's only one thing to do in a situation like this... Touch it! Watch the cutscene that happens when you do.

Hit CHECK to see if the password is 4444. After your epic failure, you're done with this box for now.

Once you have interacted with that box, as well as found the [Bookmark FRONT], [BOOKMARK BACK], and [ENNEAGRAM BOOK], new dialogue opens up with Ethan and Ikuro again.

Speak with Ethan to acquire [ETHAN'S L-GEAR] and speak to Ikuro to get [IKURO'S L-GEAR]. 

With some new numbers to try, attempt to solve the box again.

Once you fail again, Dan realizes that he's missing something.

Go see what you can learn from Jude!

Now that you have all four L-Gears, it's time to try that box again!

Have you figured out the combination to open it yet?

Let's review all of the information we have.

Still haven't figured it out?

Using the bookmarks as a guide, you can assign a number to each title. for instance, 'The Helper' is 'their heart,' and the heart is marked as 2 on the bookmark. Following that same logic, you can figure out the rest.

So the correct order for the box would be 3 7 4 5.

Well done! With the box open, you can now interact with the gold authenticator underneath to watch a cutscene.

With that done, you can now open this door.

As soon as you do, you'll escape the connecting car and complete your investigation!