As of this writing, Capcom Arcade Stadium is the third most popular game on the Steam charts.

Steam is filled with automated bots that buy free games and idle in them for trading cards.

Capcom Arcade Stadium is an emulator that runs just one free game upon download: 1943 -The Battle of Midway.

While Capcom Arcade Stadium has been free since it was released on May 24 of this year, the game was updated with trading cards on November 11.