This is a typical pay-before-play model. The user needs to pay for the game before downloading it. Normally, these games do not have in-app purchases or in-game advertisements. This is just a one-time buy for the user for the gameplay, and normally all users have the same opportunity for game progression.

This kind of model offers the game for free but may include in-game advertisements to generate revenue. The user can play the complete game for free but does not have any extra privileges for any actions.

This model offers the game for free, and the game can be played completely without any real currency spent on it. However, this model offers in-app purchases to provide extra content or facility for game progression.

This model is years old. However, very few developers prefer using this model. Developers create a separate build of the same game with different features.

The free version usually has limited content or limited use. This version may or may not contain advertisements. The full version of the game usually follows a typical premium game model. Sometimes, developers use in-app purchases within the free version of the game to unlock the full version, which is a smart way to do the job, as it eliminates the hassle of creating and managing two different applications.