Beer Pong robots built using Roomba vacuums are nothing new. Would you like to build your own? SparkFun has shared a piece that gives you an idea what you need to build your own beer pong robot. This robot gives you a moving target as you play the game.
You are going to need Teensy 3.2, motor driver, wheels, gearmotors, Redbot sensors, and a few parts to get started. More information is available here.