The Sugar is an item found in Fatty Bear's Birthday Surprise.
Fatty Bear's Birthday Surprise Edit
Fatty Bear will need the sugar in order to make Kayla's birthday cake. Fatty Bear will find the sugar in the garage. In order to reach the top shelf, the ladder will need to be clicked first, so that the ladder will be in front of the shelf. Once that is done, Fatty Bear can get to the top shelf and obtain the sugar. After Fatty Bear enters the kitchen with the sugar, he will automatically place the sugar on the counter.
When used for making the cake, Fatty Bear will need to input 3/4 cups of sugar into the mixing bowl.