International Snooker

This can happen naturally while playing the game, however to improve your chances, set up a quick game match and change the set up to make your opponent human. Take it in turns between controlling both player 1 and player 2, to knock 2 red balls towards one of the middle pockets (as these have the widest opening). Adjust your power for each shot accordingly so you only slowly nudge the red balls towards the pocket and can place them easier and closer without actually potting them.

When you have them both literally sitting on the edge of the drop, make sure you are using player 1 and take a gentle shot onto them and they will both fall in. This can take a couple of attempts to execute properly. Trying to pot them with a lot of power will generally result in one of the red balls bouncing out due to hitting the pocket cushion.