CurvyLinesEverywhere
Really Experienced
Friedman has coded the site.
I just added a few features and fixes.
Creating (seemingly random) random numbers is technically not that difficult. It's rather where that option should be shown.
Also, there are other very important features for game mode like being able to do calculations with more than one variable.
So an RNG would be more useful with other calculation features.
What if you did it client-side? Then it wouldn't strain the servers at all, in theory. You'd just serve an HTML page with inline code as-written by the author, and each browser would crunch the numbers using locally cached shit. It's not like these things are competitive multiplayer.