Retro games are great, and gaming competitions can be fun. There are big gaming competitions held all the time in the world of e-sports with big prize pools for the various winners.
Here in the Steem and Steem Engine token world, there are all sorts of little competitions going on for various things that usually reward in tokens or in shares of Steem Basic Income (SBI). It would be fun and interesting of a retro gaming competition could be arranged that would reward in tokens or SBI like this. It could be anything from a sports game like a baseball game, to something more classic like a Mario game.
When it comes to cryptocurrency in general I think one of the ways to help introduce people to it and keep it interesting is to make it fun.