There is a known glitch in the game where even though you have completed all of a Sim's tasks, you will not be given BFF status with that Sim. It is not known what the cause of this is, but it may be possible that the glitch is caused when either when you delay doing a Sim's post-task, or some other reason.
When you do a task, 2 green ++'s will appear above a Sim's head. Sometimes, a task will not increase a Sim's relationship (usually tasks that don't require much effort).
Throughout MySims Kingdom, you'll be able to interact with many characters (around 40-50). Although being nice/mean doesn't gain/lose you any friendship, you will gain a few essences (Happy if you've been nice, Sad if you've been nasty). Interacting with other characters is necessary to progress through the game. Normally, you can do 3 interactions with a character; Talk, Be Nice, or Be Mean. Be Nice or Be Mean will temporarily disappear and be replaced by the "Socialize" interaction when you are asked to do some socializing task with another character. Since socialization is a task, it will gain you friendship after your interaction with the character (but it must be a successful socialization).
You can learn more about other Sims by Talking with them. You also use this social interaction to receive tasks from the Sim (when they have a yellow exclamation mark over their heads), or when you want to tell the Sim that you have finished a task they distributed (gift box hovers above their heads when this is the case). If a task isn't currently in action, you can talk to the character just to learn a bit more about their personality and to exchange a few pleasantries.
|Exchanging pleasantries||Sim giving a task||Telling a Sim that you've finished a task|
Use the "Be Nice" interaction to do a friendly interaction with the Sim you are facing. Doing so will give you Happy essences. Depending on your friendship level, you will do different Be Nice interactions:
Relationship Lv. 1-3:
- Give flowers
- Cheer up
- Tell joke
Relationship Lv. 4-5:
- Juggle balls
Relationship Lv. 6-7:
- Stomach high-five
Execute the "Be Mean" interaction to do a nasty, mean interaction against the other Sim. The other Sim will then send Sad essences at you.
Relationship Lv. Acq.
- Foot stomp
Relationship Lv. Freind
- Puts on mask
Relationship Lv. Best freind
- Yell at
However, you can not be nice or mean to Buddy and Lyndsay, but you can still talk to them.