I used T flip flops here, but really they could represent any kind of logic no matter how complex. The key is we expect the same output from them. In fact, there’s no reason each one has to get ...

Sequential circuits may or may not include logic gates. Flip flops, also known as bistable multivibrators, are electronic circuits with two stable outputs one of which is the complement of the other.

Here’s another entry in the 7400 Logic contest. [Circuitchef] used gates and a few flip-flops to build a two-player ... He provides a nice block diagram which helps to understand the game ...