Released today, I've started exploring the first games, and I completely agree with the review so far! No affiliation, just a happy retro gaming fan pleased with the result. I thought it might also scratch an itch for the rest of the HN crowd.
In one of the first couple of games (looks like Loderunner), start the game, go to the first screen to the left. While in that screen, open the Terminal. You'll see uh something in the hex code. Try typing it into the terminal :).
The number "50" is not so accurate.