There are in total 8 good endings and a number of bad endings. The CGs in the game are not restricted to good endings, but occur at many places during the game. There are also some music pieces, in particular “Conspiracies”, one of the three vocal pieces, that are not accessed on the main routes, but in bad endings. This guide focuses on how to get to the good endings only.
For the romantic endings it is important to keep in mind that the game will allow you to pursue same-sex romance and the story will also change accordingly (e.g., like in real life, some characters might be surprised about this). If you want to activate this, you have to go to the options in the main menu and turn on the “rainbow mode”. If you want to have romance with the other sex, then you have to turn off “rainbow mode”. Changing the mode will only affect the game when it starts, not when you are in the middle of it.
There are not more options of gender choices than male and female, since frankly spoken, offering a full range of variants would make the game too complex to handle. Think about it as role playing: you play a high school student (even though you might not be one) and have no other option in the game. For the gender that you play, you have two options and you can play one of those (regardless of your own gender).

Another advise: when the game asks you to enter a name, I recommend to pick a “normal” name, e.g., your own one. Characters in the game will address you with this name and after a while it might feel weird and unnatural to be addressed by everyone as “R2D2” or “cutie angel”…

The first 6 good endings can be reached directly from the start of the game, they are:

- One good ending without romance
- One good ending each with any of the five main characters (plus one additional variant with Anna)

The final two good endings can only be unlocked after a sufficient number of the other good endings have been reached. In fact, you need to have reached either one good ending each with Anna, Meilin and Karina, or the two good endings with Honghong and with Ben, and then play the game again with the same gender constellation.

To reach any good ending, you have to avoid all the bad endings. How to do that? We will see soon…
Bad endings, however, might reveal additional information about the overall story, so you might want to try them out if you really like the game.

To avoid bad endings just follow these instructions:

Chapter 1: (Chapter numbers in the game are given as binary numbers, e.g., 00100 means 4.)
When it comes to decisions about how to handle your strange abilities, always follow Honghong’s suggestions, then nothing bad can happen. All other decisions and puzzles are irrelevant for this purpose.

Chapter 2:
Avoid to enter a wrong code into the iPad! If you do it, you will have a bad ending. (You can of course go back in the game to undo this.)
Also avoid to abandon your group after leaving the restaurant.

Chapter 3:
If you do some research about aliens on the internet, chances are that you get a bad ending. However, this is a very interesting bad ending that gives you one more song, so you might want to try this out once (but save before you do it!).

Chapter 4:
In this chapter, it is very easy to die. In order to avoid that, you have to chose these answer options when they appear:
“I follow you”
“I have heard two songs…”
“Maybe the accident doesn’t happen during the concert?”
“Why not?”
Other choices are not relevant for avoiding bad endings.

Chapter 7:
Don’t accept Mr Smith’s offer, leave together with your friends and chose the train on platform 2, not on 1!

Chapter 9:
Here you can reach a bad ending either when you are running out of time (after walking in circles) or if you walk into the wrong direction and get caught. Also, you can get a bad (and very sad) ending when you are with Meilin and have a fight with her.
To avoid all that, you need to walk in the following directions at the crossings:
straight - straight - follow the road - turn sharp right - straight until the bridge - turn left after the bridge
You will be asked sometimes by your friend to turn around or decide differently, but stick to the above directions and everything will be fine. Your friend’s sense of direction is not flawless…

Chapter 11:
You have to win the match against the superhumans. How to do this? Just copy the moves of Karina’s opponent on your own board. Karina copies the moves of your opponent, and this way one of you will win which is sufficient to save all of you.
(By the way: in case you lose the game, you will be sent into space to die. Anna will desperately try to tell you how to use your Omega device to save the day. Maybe you know a movie where a device with this name saves the day…? If not: what Anna means is that you should simply roll back in the game, because only you have this ability!)

Chapter 12:
Getting the laser weapons for your friends is extremely dangerous and the most difficult mini game in The Last Secret. You can avoid doing this by just letting Honghong do this task. (If you want to do it by yourself, follow closely Karina’s instructions and plan and time your moves extremely well, then you will ultimately manage. Remember that this part of the game is in real time, so every second counts!)

After you survived this, there is no way anymore to get to a bad ending.

To reach the ending, you also need to finish several mini games. Most of those can actually be skipped! This is usually obvious (if Karina asks you whether you want to solve some math problem, you just answer no, e.g.) Sometimes it is not so obvious or you even have to solve something by yourself:
- In the escape room scenario in Chapter 2, you can ask Karina to solve the riddles for you (click on Karina’s picture to activate the dialogue). Your friends will then mock you a bit, but do it without you.
- In the investigation of the old painting:
1. click on the button of the shirt of the man on the left side,
2. click the corn next to the board,
3. click on the white stone on the top left corner of the board.
Afterwards chose “Both stones on 4-4 are white” and “Because in old times one placed stones on these points”
- When trying to close the circuits in Chapter 12, after a wrong attempt Karina will simply show you the solution.
- The right path onto the mountain in Chapter 13 is the third one. Once you are up, walk to the left group of mountains.
To reach specific romantic endings you might have to solve some of the minigames a bit better in order to prove yourself. This will be specified below.

While these instructions will help you reach a good ending, for some specific good endings you need to do better... Especially Karina likes you more when you prove yourself to be smart... To learn more about how to solve all minigames I refer to the wonderful guide by AnimeMarkus.

Good ending: Friends forever

If you want to reach this ending, just avoid romance with any of your friends: you can always say no if it comes to a romantic moment, and actually if you do not actively pursue any character it is unlikely that it gets very romantic anyway.

Romantic endings:

In order to reach any romantic ending, you want to be able to go on a date with your love interest in Chapter 5. (This might not always be necessary, but makes things much easier.) In order to do so, you need to make him/her like you (and of course also take the chance for a date with him/her during the conversations in Chapter 4).
Also during the date and in the next chapters you have to do the right things to make them like you even more. In the following we list all the points that you can do in order to make them like you more, but not all of these points at once are necessary, so you can leave out some of these points and still succeed.

Good ending: Ben

You will only meet Ben in Chapter 4, so before that just try to avoid the bad endings (see above).
Chapter 4:
Choose the correct line of the song: “I follow you…”
Accept the invitation to go on the date with Ben.
Write down his phone number, you will need it later!
Chapter 5:
Say that you wouldn't change anything if you had superpowers.
Say that you want to see him again.
Chapter 8:
Call Ben using the phone number you had written down.
Chapter 9:
Take Ben in your arms when it’s time to say goodbye. Ben will then stay nearby and end up on the space ship with you. If he doesn’t end up there, you failed his route.
Chapter 10:
Feed Ben.
When he compliments you on the beach, ask whether he thinks it suits you.
Take him into your arms or kiss him when there is a chance.
Say that Ben is more important to you than travelling to alien worlds.
Chapter 12
If you let Ben get the weapons for you, that’s okay. Getting them yourself is even better, but very hard.
Chapter 13
Accept his hat
Watch out for a road on one of the photos
You should now be so close to Ben that you can go with him into the desert, if not you failed his route.
Choose the wine (that can also end up with a funny scene as bonus)
Say that your okay with his age

The rest is smooth sailing, even the talk with your mum ends up surprisingly well (for both the rainbow and non-rainbow option), enjoy some surprises there…


Good ending: Honghong

Chapter 1
Play the right move against the punk (corner point), visit him in the dan player room and say you want to spend more time with Honghong. Agree with Honghong and don't say he's too modest.
Chapter 3
Write down Mr Li's phone number.
Chapter 4
The correct line is "I follow you".
Forgo the date with Ben and suggest that instead Meilin is going with him.
Chapter 5
During the date with Honghong say that you can't calculate enough moves. Then something romantic will happen.
Chapter 7
Get up at night, tell him that you've noticed that he was not there and take his hand.
Don't lose your game (simply don't mock your opponent, then she won't get furious and goes easy on you).
Chapter 8
Remember Mr Li's phone number.
Chapter 9
Take a break with Honghong and let him hold your hand.
Chapter 10
On the beach, take Honghong's hand. (A lot of taking hand in Honghong's arc... He's a shy guy, you know... ;)
Chapter 12
Say that we cannot just kill a robot.
You can gain some more points with him if you get the weapons for everyone, but this is very dangerous and not necessary if you follow all other instructions, so you can let him do this.
Chapter 13
Notice the road on the photo.
Towards the end of the game tell him that you want to stay forever with him.

If you follow all of this (or actually most of it), you should go to the desert with Honghong. From then on it should be straightforward.

Good ending: Meilin

Chapter 1:
Take side with Meilin against Karina
Chapter 2:
Follow Meilin’s suggestion
Say that the escape room was creepy
Run after Meilin
Say you are joining in too
Chapter 3:
You’re happy she’s not an alien
Chapter 4:
Write down Ben's phone number, you will need it later!
Invite Meilin
Chapter 5:
Ice cafe
A date with you would be nice
Say that you really mean it (this only works if she already likes you, otherwise this backfires)
Chapter 7:
Math hoodies are all the same
Don’t touch Anna’s ears
Chapter 8:
Remember Ben’s phone number (which you had written down before, I hope!)
Chapter 9:
Walk a few circles in the forest, but do not walk back to the institute!
Romantic scene with Meilin: simple be nice to her and kiss her…
Chapter 10:
That’s sweet of you
On the beach, don’t walk back to check for the girls (unless you wanna have some funny event)
I’m so happy for you, Meilin
Chapter 12
Better let Honghong get the weapons, otherwise things might happen and Meilin might get jealous.
Shoot the robot
Chapter 13
Notice the road
You might get some bonus if you do the conversation with her in the tent really well, but you have to figure out how to do it…
Chapter 15
Nod when Karina asks you whether you like Meilin.

Congratulations: you got a life together with Tsundere-Meilin! ;)

Good ending: Karina

Chapter 1
Take sides for Karina
Solve the rectangle puzzle (if you don't, the solution is shown to you, so you can back and solve it. Yes, it's cheating, but so is reading guides like this here... ;)
Don't cheat in the liberty puzzle.
Follow Karina when she runs away.
Smile at her.
Chapter 2
Follow Karina's idea.
Suggest to disconnect the connection.
Suggest aluminum foil.
Solve the escape room without much help from your friends. This is fairly important as Karina will like you more when you are smart...
Chapter 3
Write down Li's phone number.
What a pity that Anna is not an alien!
Ask Karina for the formula on her hoodie and watch the Mandelbrot set video.
But Anna doesn't look like that.
Don't say that you were always bad in math and that you like music more than math.
Chapter 5
Ask her about math on your date (you may want to try out Japanese too, because it's fun, but revert back to math for more chances with Karina)
Chapter 7
Mention Karina's Hoodie and the Mandelbrot set. (If not done before.)
Remember one of the phone numbers (Ben or Li).
Chapter 9
Take a break with her and say that you like to be here with her and hug her. Then you end up with a romantic scene here. Without that scene it will be impossible to win her heart later on.
Chapter 10
Hug her and say she looks beautiful. (Who wouldn't say that anyway? ;)
Chapter 11
Know Galois.
Be happy for Karina.
Birth year of Jesus.
Feynman is cult.
Chapter 12
Hair clip idea
Solve the connection problems (again, if you fail you"ll see the solution and can rewind.)
If you get the weapons by yourself she likes you more, but it's dangerous and not really necessary.
Shoot the robot (but also not really necessary if you get everything else mostly right).
Chapter 13
Find the approximate location on photos (US).
Find the street on the photo.
Chapter 14
Now you should be in the desert with her.
Do not avoid talking about math with her.
Know that there are as many natural as integer numbers (you should have most likely seen this in your dream in Chapter 6).
Afterwards
The only thing that can go wrong now is that you like Meilin too much and Karina notices. Then she will decide not to stand in your way. Just make sure that this won't happen. A critical situation for this arises when there is an argument between Marvin and the player. If Meilin likes you, she might take sides for you. Marvin will mock her that she's in love with you. She might react in a way that confirms that. Karina might then directly ask the player if he likes Meilin. Obviously, you should avoid saying yes. (In this case, you will break one girl's heart. – Life is hard...)
When bringing Karina home, you should say:
You mean between you and me?
Then you pick either:
But it's clear: you are my girlfriend!
or:
From now on, I will always accompany you home.
(Depending on what happens.)

Congratulations: You'll be doing lovely math forever now!

Good ending: Anna
Chapter 1
Say that you like school uniforms. (However, if you want to see Anna in a different outfit later, you might want to change your answer. It is also possible to have a good ending with Anna if you pick something else.)
Chapter 2
Do the escape room well (i.e. without much hints from your friends). That's rather important for Anna.
Say that the escape room was interesting.
Say that you want to be friends with Anna.
Understand that she wants to keep her secret.
Chapter 4
Like her school uniform.
Decide to go on date with her.
Chapter 5
Tell her that you understand her.
Chapter 6
Say the song was wonderful.
Chapter 7
Touch Anna's ears.
Chapter 10
Know a bit about astronomy.
Say the strange food looks delicious.
Agree with Anna's statement about board size in Go.
Ask Anna where she used to live.
Know Stanislaw Petow.
Feynman is cult.
Chapter 12
Don't get the weapon by yourself if Karina likes you too much. Something might happen and Anna might get jealous! Otherwise it would be good (but again, dangerous).
Shoot the robot.
Chapter 13
Notice the road on the photo.
Choose Anna to go into the desert.

Afterwards you have to remember Helvetios and wish for something romantic after the shooting star.
In case you like Meilin a lot, there might be a choice you have to make. If you want Anna, don't choose Meilin (obviously).
There are two possible endings with Anna. Which one you end up with depends on whether you decide to follow her to the stars or not. In both cases, a good ending will be the result, even though in one case you have to be patient...

Congratulations: you've conquered Anna – and the universe!


The final two good endings

Once you have reached either one good ending each with Anna, Meilin and Karina, or the two good endings with Honghong and with Ben, and then play the game again with the same gender constellation, some strange things will happen… and then stranger things… however, as long as you keep playing, you will reach the next good ending for sure.
The final good ending will be reached if you write a story of at least 25 lines by yourself. (What does that mean?!? You will see… :)