Ok, so while having a one thougt in a second about seven deadly sins, one thing right away came into my mind - this should become a challenge for TS3. With a suprised, I check within google and I find some people already suggested his type of thing. While putting a little of a thought, I should create one that is more in depth then those two as I mentioned.
Another thought came into my mind that this should work in conjuction with Asylum C. - and another thought pop in and I though of a better, and interesting (imo) way it could play.
Ok, to start off: You create 7 sims that are based off seven deadly sins, and one more sims that is the queen/kind of sins that unites them. All of them must live together in one household. Those sims will have to do their related to-their-vice tasks on a regular basis. If you're sims stops doing them for 3 hours, they will instantly died (via with the use of your hacks or cheats, such as testingcheatenabled, by dragging their hunger down to 0%). If the queen/king/uniter dies, you lose the challenge.
For a better playability experience - set the free will option to off.

1) Unique character
Kind/Queen/Uniter of the 7-sins.
You pretty much can do anything you want with him/her. The Only thing you have to focus on this sim is to keep him alive as possible, or else you will loose the challenge right away. What's interesting about these individuals, is that whenever one of the "sins" died (excluding old age), (s)he gains it. Since this sim can get injected with all 7 of them, that's what makes the player of challenge to be careful of not losing any of these sims.
Lust:
This sin-sim needs nothing more then to flirt and do some plessures activities in bed. *Nice description needed*
Tasks:
- This sim must flirt or woohoo/try for babies with anyone (and I mean it: it can be with the same gender, if you percieve your sim straight, gay, bisexual...)
- Have them do anything that is considerate as a romatic thing.
- Use the dream pod to dream about romance.

2) Sins and their tasks
Wrath:
- Must been mean with every sim (s)he meats.*
- Once the "fight" interaction is unlocked, you must use it on that sim everytime you encounter him/her.*
- Detonate any sim's stuff/objects.
- Have that sim "murdour" townies (on your lot) or bring harm/vengeance towards the person who pissed him.

- Includes; casting curses (fire spell too), pranking, summonging sharks as a mermaid,

Traits; Hot headed, Mean-Spirited.
- If the sim is in a bad mood, s/he may insult any sim near him/er until they become enemies.

Gluttony:
- Everytime the hunger bar goes slightly down or when its even full, you must cancel the action of what the sim is doing and send that sim to eat straight away.

- The Sim must eat any food, no matter if its spoiled or poisonous.

- Have your sim drink anything at anytime, especally if there is no food around.
- Have the sim eat a jelly bean every 4th day after or when there is no food around.
Traits; N/A
Envy:

- Have that sim act out mean towards a person that owns an expensive object (who the sin oned can't afford and doesn't have)
- Insult others that took the women/man he/she loves (in other words, a crush or who envious is attracted too)
- Have the sim be rude to those who already have fulfilled the same Wish that the envious haven't.
Traits; Mean Spirited or Diva (second is a better option if your game as it)

Greed:

- Earning money (in any possible way)
- Steal an object (as a kleptomaniac)
- The Sim will marry a rich sim (or poor in particular), "killing" him right after to keep.
- Whenever a sim has a wish of buying something, you must lock that wish (replace if there already 4 filled) and buy that certain object if affording it is possible. (If not done/cancelled, the result will be death)
- Mooching
- Gather collectables (gatherer trait sim must gather more then 3 collectables)
- For becoming/transforming into every life state (for Supernatural Fan trait)
- For adopting/adding every animal in the house (for Animal Lover trait), dog (for Dog Person), cat (Cat Person), horse (for Equestrian)



Traits: mooch

Sloth:
- Have the sim do basically nothing: lay on bed (or on ground) and watch some tv.
- This sim won't exercise, draw, paint, play guitar, gain skill points, but if they do - cancel their action.
- Have them avoid any emergences (fires, burglars)
- Using hot tub
- Resting one's butt off on something sittable
- Playing video games on a computer or console
-
Trait; Couch potato.

Pride:
- This sim will try his/her best to become a celebrity.
- The Sim will automonously look at his/ers own appearance through the mirror.
- Insults other sims as llama, mocks their cleverness
- Earning an promotion
- Is proud to gain a skill point
- Bragging [is there even any such of an interaction?]
- Fulfilling any Wish
- This sim cannot wish for resurrection to the genie, unless (s)he has the Wish for. (results in death if promth)
Traits: Diva, Brave, Snob









Goal: If you managed your playable sims to stay alive throught the rest of a challenge, including the ones up to then until they died by old age only, you win the challenge. As a reward: your sims now are freed from their sin and your household gets 50,0000 simoleans (you get the access to use motherlode). Otherwise, you only have your sims freed from their sin and.... that's it. The Challenge wouldn't be fun in challenging yourself if you killed your sims intentionally, If it weren't for money

Definitely gonna try this :3

Update from 26-10-02/03 (tasks that have [+] mark are added to the original post, [-] for those that are removed from OP, [~] for those who are changed into from OP)
Pride:

• [+]Earning an promotion
• [+]Is proud to gain a skill point
• [+]Bragging [is there even any such of an interaction?]
• [+]Fulfilling any Wish
• [+]This sim cannot wish for resurrection to the genie, unless (s)he has the Wish for. (results in death if promth)

Lazt

• [+]Using hot tub
• [+]Resting one's butt off of something sittable
• [+]Playing video games on a computer or console

Greed

• [+]Earning money (in any way possible)
• [~]Steal an object (as a kleptomaniac)
• [~]Gather collectables [gatherer trait sims must gather more then 3 collectables]
• [~]Whenever a sim has a wish of buying something, you must lock that wish (replace if there already sin-releated 4 filled) and buy that certain object.
• [-]Gaining any skill point.
• [~]For becoming/transforming into every life state (for Supernatural Fan trait)
• [~]For adopting/adding every animal in the house (for Animal Lover trait), dog (for Dog Person), cat (Cat Person), horse (for Equestrian)

Wrath

• [+]Townie enemies will have to be "killed" on their residential lot.
• [~] Have that sim "murdour" townies (on your lot) or bring harm/vengeance towards the person who pissed him.

Lust

• [~]Have your sim embrace their inner cupid via romatic interactions towards other sims, eg. let it be flirt or woohoo.
• [+]This sim finds anyone attracted, even those who are engaged and married.
• [+]The Sim must do their lusting tasks on the spot; where both of the lovers met, no matter if they are witnesses in the same room encountering the affair (spout or their relatives).*
• [+]]Full fill only the Wishes that have to do with performing erotic tasks or that leads to the said one. (results in death otherwise).