“Minigames” are small, short and self-contained games, within a larger RPG or MMO (as well as other game genres). Sometimes they are incidental and have no major bearing on the wider narrative or progression. For example, in The Lord of the Rings Online, you can take up fishing as a hobby. It is an additional activity and nothing more. Many players enjoy it as it can be very relaxing. Minigames of this nature are optional and can be ignored if the player sees fit. When mining Dilithium in Star Trek Online, there is a simple minigame where you have to match your onscreen triangular reticle over a secondary triangular marker that moves over the Dilithium seam. When they are aligned you start mining. It adds a nominal amount of effort to what is otherwise an arbitrary task. However this minigame is mandatory if you wish to do this task. If you elect not to do it then you cannot mine but there are plenty of other ways to acquire Dilithium.