I’ve guessed most the major design features this game has had in the last 2 years, as well as the near specifics of balance changes for Roadhog and Mei.
I also got about 40 changes into a game called PlanetSide, including how all the 40 or so base/warpgate links are structured, with emails back and forth with their executive producer. I also wrote an installer that the devs later copied that pulled in +30,000 downloads in a community led marketing campaign.
And previous to that I wrote a server modification for TRIBES called Shifter_v1G, that had about 40 servers running it, and ran in tournaments for 2 years with about 30 team.
What you got?