This one is easy. I’m giving you this cheat code in confidence. Don’t tell anyone. The next time you see three attractive women, just say "Harem Starter Pack!" while looking at them and you’ll be transported to a parallel universe where you’re dating these women!
The multiverse is big, and surely there’s one universe out of an infinity where it could happen, right? The cheat code will find it and get you there. The great thing about it is there’s no mind control involved. These women are dating you of their own free will, because you — or rather, your doppelganger in this universe — seduced them. This means they keep their personality, except for the fact they’re in love with you, and they’re okay with sharing you in a harem-like arrangement.
Okay, the bad news is this new universe will be different in small ways. History may be somewhat different, with other world leaders and wars. The taste of some meals and drinks could feel different too. And you’ll pronounce a couple of worlds slightly wrong to the ear of people in this new universe. Basically not terrible, unless maybe you’re a history teacher.
Oh, another piece of bad news. As I said, this is not mind-control. These women’s doppelgangers are in love with you, sure, but this love is neither eternal nor unconditional. Behave badly, and they’ll leave you. Also, if you happened to pick a bitch in your harem, her doppelganger will be a bitch too.
Also, since you’re transported in person, you can’t be changed either mentally or physically. Worse, it’s perfectly possible to pick strangers for your harem, but their doppelgangers will remember flirting and dating your doppelganger for a while, while you won’t. This makes the first interactions quite funny.
Now, there are some conditions.
Also, there may be some hindrances, which make finding a correct universe harder.
For each hindrance, the cheat code has only a 50% chance of working. (Flip one coin per hindrance; it works if all coins are "face".) If it does work, all the hindrances go away. These versions of the women are straight or bi, not engaged (or to you) and obviously accepted to date you. (Twins are still twins, and richer women are still richer, they just don’t care.) If it didn’t work this means an infinite multiverse is still not big enough… And no further attempts on these particular women will ever work! But you can try again with another group of women.
Finally, surely you’ve noticed the word "starter" in the cheat code. It does mean you’ll be able to add new women to your harem. But it doesn’t mean they’ll magically fall in love with you, like your three first ones did. Still, this new universe is probably very harem-tolerant, and you actually gain prestige, not disdain, for having one. So, seducing someone when you’re already dating a harem is not all that hard. Lets make a formal rule out of it: you have a 50% chance of forging a new meaningful relationship each year. Remember this is not a gift. You have to work for it. If you’re an asshole, your chances will be way worse. Also, the more women are in your harem, the less attention each of them gets from you, and the faster they’ll leave. There is a balance to be found.
Now, that was just the basics. I find you likable, so I’m throwing three freebies in.
Your cheat code works on exactly four women, not three.
Pick this freebie twice, and your harem starter pack will be five women strong.
Ignore up to three hindrances when you use your cheat code. (Assume they came up "face".)
Pick this freebie twice, and you can ignore up to six hindrances.
The cheat code works on women married to other men, but it's a hindrance. An engagement is no longer a hindrance.
Also, you can now use the cheat code if you're dating. If you do not include your girlfriend in your starter pack, flip a coin. On "face", your doppelganger is still dating her, but she doesn't know about the harem. Otherwise, she's a stranger or an ex.
Pick this freebie twice, and married women are no longer even a hindrance. Also, you always keep your girlfriend.
You’ll gain roughly half the memories of the version of you that inhabited this world before you took his place. This is in addition to yours, and may be hard to access.
Pick this freebie twice and you’ll get all of them, plus one random skill from your doppelganger (music, cooking, business, a foreign language) that you haven't developed yourself.
The women’s doppelgangers are all bisexual or pansexual, rather than straight.
Pick this freebie twice, and they're willing to try threesomes, group sex, or swinging with other people.
The women’s doppelgangers are all submissive. If the original was a domina, her doppelganger is a switch.
Pick this freebie twice to flip a coin for each woman. On a "face", their doppelganger is your willing sex slave.
The women’s doppelgangers in the new universe look the same, but they have larger natural breasts. If the original had fake boobs, they’ll have larger fake boobs. They increase to C-Cup if lower, and by one cup otherwise.
Pick this freebie twice and you get two more cups on top of this.
Flip a coin for each woman. On a "face", their doppelganger in your new universe is a bimbo, meaning she is superficial and tries her best to conform to the prevalent female archetype.
Pick this freebie twice, and the change is automatic (don’t flip any coin) and more pronounced.
Flip a coin for each woman. On a "face", their doppelganger is a futa, with the same feminine body and a very virile penis.
Pick this freebie twice, and the change is automatic (don’t flip any coin) and their penis is bigger.
Polygamy is legal in your new universe, so you'll be able to marry each of your lovers, provided that they agree.
Also, you can use the cheat code while married. Your wife counts as one of your three targets, but you don't have to see her. This is a hindrance unless she's bi or submissive.
Pick this freebie twice, and your wife no longer counts as one of your three targets or as a hindrance.
This universe loves harems, so yours will grow faster. One new woman has a chance to join every 4 months.
Pick this freebie twice, and your harem has a chance to grow every month.
Once you use your cheat code, you’ll get $100.000 in your bank account.
Pick this freebie twice, and you’ll get one million instead.
No problem. If you’re a straight woman, just reverse everything. You get three men for your harem, you get a hindrance if they're gay, the Bimbos freebie becomes Himbos, etc.
If you’re a lesbian, don’t change anything, except the orientation hindrance.
No problem. Just add men to your harem instead of women, and adapt the orientation hindrance.
No problem. Your harem may include both/any gender, as long as you're attracted to the person. Again, their orientation might generate an hindrance.
No problem. It is kind of assumed anyway.
If you're already in a polycule, you can use the cheat code anyway, and each target will either date you or join your polycule (your choice).
No problem. You get a romantic-only harem. Your target being ace is no longer a hindrance, obviously.
If you’re aromantic, you get a bunch of best friends.
No problem. Trans women are women. Trans men are men.
No problem. The cheat code will work again once you’ve lost every women it added (so, not your original girlfriend, wife or polycule). What you can’t do is make the women leave your harem on purpose, to get another one. The multiverse won’t like it, and it will make you wait a year before the cheat code is available again. (Also, don’t try to spam the Money! freebie this way, it won’t work.) Note that using the cheat code a second time gets you to a third universe, etc.
If you manage to keep your harem happy for three years, you get access to a new cheat code.
Saying "Harem Expansion Pack!" while looking at three attractive women adds them to your harem, with the same rules (except that you're not single, ofc). This is hard, though, with one Hindrance for each previous successful use of a cheat code (including the "Starter" one).
The cheat code stops working while your harem is unhappy, and for three month after that. FYI, keeping that many people happy may be a challenge!