Cheat List
While playing in Bust Out or Free Mode, quickly enter these key presses on the D-Pad and/or specific buttons.

Permit cheats - DOWN, L, Z, R, LEFT, RIGHT (this causes a gnome to appear on the Sim's property, signifying cheats are enabled)

Unlock all locations - DOWN, Z, R, L, Z
Unlock all objects - DOWN, Z, LEFT, RIGHT, R (alternate versions: DOWN, Z, UP, UP, R and LEFT, Z, UP, UP, R)

Sims never tire - Z, R, L, UP, DOWN, UP

Unlock all socials - L, R, DOWN, DOWN, Y

Dev team picture - R, Z, DOWN

Hint: Mindless Fun
If one of your Sims is in a bad mood and you want to quickly get his or her mood back into the good zone without constantly overseeing it, make a small room with windows and a door into the house (this door is to be torn down later).

Then add a microwave, counter, fridge, a three seater sofa (so the Sim can sleep on it), a TV, lights, a toilet, a table, chairs and anything else if you want to. This will supply everything your sim will need.

Get the Sim to enter the room and go remove the door. Make the Sim test everything out and it will not go out the room (while its happiness increases). Connect the room back to the main house when the Sim has gotten more happier.