Hi.
So you've finished everything, unlocked achievements and wonder what next.
Well, while I agree there is not much you can do in HCS, there is something. And that something is called challenges and high scores.
There are various challenges out there, but I'll be covering the one girl challenge here, its key aspects and stuff. And of course while there are two variations of it, one I'd call strict mode (your first girl is your final girl) and the other one free mode (you spend some time in the model agency picking a girl, because you want to for example do it with Zoey or whatever, your very final choice is your final girl) I'll be covering the strict mode, because even here the play styles can differ and on free mode even more, because there it's impossible to predict which girl you pick.
Several disclaimers:
1. This is not intended to be a full guide! I want you to discover certain things on your own too!
2. This will NOT work on rock hard mode, because that requires a different play style.
3. This will not be compatible with 8 girls high score challenge, but it will be compatible with two, maybe three girls high score challenge. The thing is, you can get pretty high with just one girl and it isn't the easiest to get higher with a little more girls than that. With two girls you may be able to gain 2 days worth of fans more, but hardly more than that. The reason for this is simple, fans being awfully spreaded through girls' unique fetishes.
In case you're wondering why should you read this guide, here is my current high score.










And in case you're suspecting me using an autoclicker, the run below is with autoclicker. Both runs are with coke at the opening, In the autoclicker run I just dropped coke as time was progressing, which explains lower everything except for rushed minutes. Dropping the coke was not the reason why I had such a low amount of fans btw. I was simply too slow thanks to the will of RNG and a couple of mistakes I made.











So, wihout further ado, let's jump into it.

If you're like me and you're playing on strict mode, there is no real guideline.
Feel free to pick according to your thoughts or personal preferences (or just pick Tiffany if you don't know). The only thing I can say is that if for example in the previous game Glasses were number 1 fetish, you shouldn't pick Nikki in this one. RNG will make sure you'll regret it.

However, if you want to pick a somewhat developed girl, I can give you a couple of tips.
1. Pick a girl with high style. It's good to have at least 3 style.
2. Pick a girl with as low addictions as possible. The reduced stress is not enough to compensate for the time you spend shopping for the liquor, in fact you lose a little bit of time.
Of course in practice there is no best choice, because everything depends on rng and ads. So in the end pick you can pick anyone you want if you want.

Anyway, let's jump straight to it.

Days 1-5. In the first two days upgrades are the most important, because you need to get your income rolling. You can neglect the fans, but make sure to refill them in days 3 and 4.
Tip: Start by going to adult shop for a sub pillow. If they don't have it, pick coke or condom if you can and go again. If they don't have it even for the second time, restart. At the beginning speed is very important!

So, to begin, I'd say gravest0rm has a nice strategy in their youtube videos and it is the one I learned from the most. Maybe it's not the best one, but it's hard to find the best one, since many strategies yield pretty much similar results. Increase style to 3 and then take some cash (or just leave cash taking for day 2 and focus on getting talent to lv 3 first). By the end of day 2 you have to buy 2 accountants, inventory, cam upgrade, photo upgrade, productivity and some small autocollecting.
On day 3 hunt for some fans to make up for the need of more money (for this purpose having 4 style may serve better than 3 style, but 5 style is too much I'd say) and at the end of the day become 5/3. And on day 4 buying 3 ad upgrades and purchasing all ads.
At the end of day 5 you should have:

1000+ fans (2000+ if you're aiming at 400k+ fans. Do not worry, it is 100% doable)
2 inventory slots (one with pillow)
at least 3 levels of ads
5/5 character

And if you want to play my style, the key to that is coke. Whether you just want to speed up the beginning, use the coke permanently or temporarily, coke is always a viable option (although playing without coke is perfectly fine), since it compensates for the time you lose by searching for new cokes by halved time needed for everything including rest (if you can't find a coke, pick a condom if you can. If you can't, pick any fetish items. If you have enough condoms - for me it's 3 -, use them once you either run out of coke or find a new subscribe pillow to replace the one you're wearing now). Of course playing with coke means you'll be more susceptible to RNG, because it can happen that you don't receive cokes 7x or 8x in a row (my record is 14 times without coke, which made me begin a new game, in which I had 10 cokes in a row, which was too much, because I needed fetish items). If you're unlucky or just have a bad opening run, feel free to restart. Remember, this game is RNG based, so restarting is no shame.

In other words the phase between day 6 and 100k fans.
A middlegame phase is very crucial for your company's development. Having a 5/5 girl and a subscribe pillow, you will eventually cease using photo shoots, because the length of a photoshoot just won't be worth it.
When you can, buy an upgrade. Try to fully upgrade ads before you reach day 8 and always purchase them all. If you can't purchase them all, always pick the ones you can potentially support over the ones you can never support. While at first you'll still be gaining a lot of fans from the subscribe pillow, ads are still the thing that increases your fanbase the most. And you need supported fans to generate money. And you can't believe how quickly this can change.
As time passes, you'll eventually be getting to a phase where an ad produces so many fans every day that your supported fetishes lose their number one spot and you'll need to switch them. If you hunt for coke, you shouldn't have too much trouble with that as you can usually get replacement items as you go. If you don't, it's always better to wait a couple of days to see how it works out.

This is the time RNG can seriously screw you over, especially as you're getting to late middlegame-endgame, because the fan gains from so huge will eventually get to thousands and if you get a terrible fan spread (for a reference a good fan spread is when you support 30% of the fans with coke, 40% without coke), you won't be earning enough money and the best thing is just to start over (it CAN and WILL happen, my worst middlegame contains impressive scores of first 4 fetishes being unsupportable and my best two supporting 16% of the total fanbase).

By the time you reach an endgame you should be missing only $500k accounting.

There is no really fixed guide as to when you should take it off, but it is better to keep it on while you're earning little cash, because it is a good source of fans through the middlegame. However, I'd say that when you reach 20000 fans, it's time to take it off, because that's the time when you need money much more than fans a sub pillow can generate, otherwise you won't be able to keep up with the prices.

From 100k fans till the end. Depending on many factors (for the most part it's the late opening/middlegame though, your first 2000 fans are crucial) you can reach the end game 8 days after you reach 2000 fans (if you reach them on day 5, it's day 13). Probably the biggest screw overs in the whole game, because while the opening and early middlegame can be saved by the Subscribe pillow, everything here depends on how fast can you reach 80k supported fans (the amount of fans you need to be able to purchase all ads). Depending on how fast you reach it, your final score is decided, because that is where all ads increases get capped. The rules are the same, if you can't purchase an ad, always choose the ones you can potentially support over the ones you can't support. You can always try to spare money for the next day in hope for a supported ad. But I wouldn't recommend that and instead advise you to spend the money on the ad, because as time passes, you're sure to have more than enough money to buy all ads way soon in the last day (you need around 3.3-3.7 million a day to buy all ads).

Depending on your game version you receive fans worth of ads. If you use the latest version (1.0.2), you'll receive 45-55k fans worth of ads every day. The ads have been seriously nerfed compared to 1.1, they are more expensive and deliver less fans. So if you want to aim for high scores, 1.0.1 is the way to go (although unless you have it, it's probably impossible to obtain legally).

It is also pointless to buy the final 1 million accounting upgrade unless you know you can afford it. I bought it in the top picture, but on day 21 when I could gain only about 200 extra fans.

Your first 2000 fans matter the most. But don't be ready to sacrifice everything to reach them, you need development at the first two days!
Don't be afraid to experiment! Who knows, maybe you can find some improvement!
Don't be afraid to restart! Although if you do it too often during one session, it will probably be better to just quit the game and open it some other time.
As I said, this guide is viable even for 2 girls run, because the second girl will help you buy the ads you'd normally miss.
You don't lose/gain any time when you enter the spa at 25% or at 100% stress! Meaning that if you alternate Cam show-Spa-Cam show-Spa (or Cam show-Adult shop-Cam show-Spa) you end up with more rushed minutes without losing any time, because autocollector will collect some cash you'd otherwise collect yourself (wasting rushable minutes) if you did Cam show-Cam show-Cam show-Cam show-Spa! (it's not much of a boost, only around 2000 rushed minutes, but better than nothing).
Although it is true that rushed minutes have very little influence on the end result. They undeniably have some, but from 50000 minutes onwards the return is diminishing. It is much more important which decisions you make and how fast you make 2000 fans than how fast you click.
If you want to boost your rushed minutes though, feel free to make use of extra left mouse click remaps! If you have a programmable keyboard or even using the Windows helping program "Mouse by keyboard" (or how it is called), anything that can increase the amount of left mouse buttons will help. This way you'll have a fully legit score, because you haven't used an autoclicker, while still keeping most rushed minutes (80k or 95k as can be seen in my two pictures really did not matter that much in the end, even though the difference in rushed minutes is equivalent to two extra cam shows. What mattered was that I dropped the subscribe pillow too soon in the autoclicker run).

Most importantly though, have fun and aim high! That's what this game is all about :)