minigame; subgame; microgame
A small, self-contained game within a larger video game, often with its own rules and objectives.
This RPG has many minigames you can play at the casino.
If you get a high score in the minigame, you can receive a rare item.
practice game; reduced-player game
In sports, a practice match or scrimmage, often with fewer players than a full game.
At the end of practice, we played a 7-a-side minigame.
We played a match in a minigame format that also served as passing practice.
This app has a section where you can play kid-friendly minigames.
We wrapped up practice with a short scrimmage.
If you clear all the minigames, you unlock a hidden character.