Euler QQ Four-Player Landlord Score Boosting Anti-Hack Free Version; made by Euler, quality guaranteed! Truly virus-free, no plugins, no ads, absolutely green and single-file.
If your computer and internet speed are good, you can open 8 or 12 accounts, or even more to boost scores simultaneously (the same account just shouldn't be in the same zone).
In that case, the score boosting speed will be 2 times, 3 times... faster than opening 4 accounts.
Reaching Emperor level is very easy.