Old MMO EverQuest 2 witnessed "amazing growth" after turning free-to-play last month.
Sony Online Entertainment president John Smedley shared boast-worthy statistics on Twitter.
"We are seeing some amazing growth in EQ2," wrote Smedley.
"40 per cent increase in daily logins since going F2P. 300 per cent increase in new players.
"And 200 per cent increase in item sales. Plus we have added a lot of new subs."
He added, referencing SWTOR: "All during the time that some really good competition hit the market."
EverQuest 2 launched at the same time as World of Warcraft - November 2004.
A third EverQuest game is confirmed as in development. It's codenamed EverQuest Next and is likely to appear on PS3 as well as PC.
The status of its development is less clear. SOE hit hard times last year and ended up cancelling promising PC/PS3 MMO The Agency.