There are four main options for in-game advertising: 1) inserting a brand into an existing game, which has a lower cost but less control; 2) creating a branded game, which tightly integrates the brand but costs over €20-30k; 3) using ad-funded games where ads are shown to players, providing an inexpensive solution but potentially annoying ads; 4) giving away mobile games for free through partnerships, allowing branding through the partnership but not within the game itself. Each option has advantages of cost and brand integration but also disadvantages like lack of control and potential player annoyance from ads.