I just nailed it with a release in Y35 M12 W3, right before the scoring time ends -
The Bastard X
KAOS Immersion (custom console)
Units sold: 118.2M
Released: Y35 M12 W3
Avg. Review Score: 10
Top sales rank: 1
Turns out the secret is to abuse the broken MMO code. I hit the ground running into the last office, rushed out my first console and MMO engine, then ran two MMOs, releasing them with full bugs to keep the scoring down and keep the time frame intact (needed to push a new engine, two expansions and two boosted employee training sessions per vacation period).
Both MMOs ended up with 10 expansions each, and by the time The Bastard X hit the shelves I had 55.2M fans (and 432,026.4M in the bank from abusing the MMO scaling so badly).
I think I could have got MMOs going a year earlier as I delayed entering the last office by most of one large game (to make my employee vacations line up for the two new employees). If you did that right you could probably get two unobtainium titles out before the game scoring time ends, especially given I had an 18% margin for error to play with here.