Here's a list of different squat variations that you didn't know existed so you don't bored.
The Ultimate Squat Guide: 35+ Squat Exercises | The Art of Manliness
Also, to build mass, we want to go heavy, with very few reps.
Here's a 5x5 workout. So quick!
Bodybuilding.com - What Is The Best 5x5 Workout That Will Produce Amazing Muscle Gain?