; (G) the language used in the product; (H) the content of materials used to advertise the product and the platforms on which such materials appear; (I) the content of any advertising materials that appear in the product; (J) other reliable empirical evidence relating to— (i) the composition of the audience of the product; or (ii) the audience of the product, as intended by the publisher or distributor of the product; or (K) other evidence demonstrating that the product is targeted at individuals under the age of 18. (6) Add-on transaction (A) In general The term add-on transaction means, with respect to an interactive digital entertainment product, a payment to the game publisher of an interactive digital entertainment product, an affiliate of the publisher, or any other person who accepts such payment for the benefit of the publisher, of either money or an in-game proxy for money, such as a virtual currency, that can be purchased with money, that— (i) unlocks a feature of the product