It's completely unknown for me about what "game" this is a reboot of, there's nothing named "The Weird Smile".
Now, the game is in portuguese, it supposedly is an alpha, having no story, only 2 modes and 3 animatronics: Lefty, Funtime Freddy, and Rockstar Freddy.
To survive, just like in any other classic FNaF Series, you have to survive until 6 AM, having to manage your battery
In order to survive, you have to do certain things through the single night the game has.
Rockstar Freddy: He'll appear either in the left or right hallway, in order to not die, you have to avoid flashlighting him
Funtime Freddy: He'll either appear in the end of the front hall or in either of your side hallways, if he appears in front, you have to close the door using the switch you have behind you on the wall, and if he appears in the hallways, you'll have to flashlight him.
Lefty: Walks to your office, making loud step noices, you have to open the door if in case you have it open and use your left hand to grab the device on the table and activate Roxy's voice right when Lefty's eyes are reflecting on top of the door frame. Each time you do it -3% of battery will be lost.