game add-on

noun
UK /ɡeɪm ˈæd ɒn/
US /ɡeɪm ˈæd ɑn/

Extra content you can add to a game to make it bigger or more fun.

I bought a game add-on that gives my character new clothes.


OTHER MEANINGS

2. An extra part added to a board game to add new rules or pieces.

The board game add-on comes with new cards and a new board.

3. Something extra attached to a main product or activity.

The museum tour is a fun add-on to the city trip.

4. A small program that adds features to a larger piece of software.

He installed a game add-on to change the game's music.