It sounds like Ryan Carmack is a silicon chip off the old block, as John Carmack tweets that we can now play Angry Face, a game designed by his nine year-old son. Word is:

My name is Ryan and I'm 9 years old. I enjoy video games a lot so I made one. I feel nervous about my game… it's rather simple. It's called Angry Face! This is my version of Pong. I wrote the game but my 4 year old brother helped me with sound and testing. He really likes the game. This is the very first game that I've created and I want to make more in the future. I hope I get a good response and that everyone likes it.

My grandma wanted a slower version of the game so I added a grandma mode and a pro mode for people who want it faster. Also, my game can only be played on a PC, Mac or laptop. It doesn't play on smart phones or tablets.