Cal. Bus. & Prof. Code § 20600

A video arcade shall post a sign that notifies consumers that a video arcade game rating system, created by the video arcade gaming industry, is available to aid in the selection of a game. This sign shall be posted on the wall of the arcade in a prominent area such as the arcade entrance, the money exchange machine, or the token counter. The lettering of each sign shall be printed, at a minimum, in 36-point type and shall be in black ink against a light colored background, with dimensions no less than 18 by 24 inches.