HI2018 is a theme code given to various items released in 2018 that were available during certain holidays and events, and weren't part of a theme on its own.
Most HI2018 items were only available through the promotions pop-up icon (megaphone - see infobox image) in the game, which is found on the bottom right next to the chat bar.
Below is a list of events and holidays with HI2018 items.
The Winter Games items were released on February 9, 2018.
The items were released in honour of the 2018 Winter Olympics in Pyeongchang, South Korea.
There were 4 clothing pieces and 1 furniture item for the Winter Games. These items were available for the duration of the 2018 Winter Olympics.
The Mardi Gras item was released on February 13, 2018.
This item was released in celebration of Mardi Gras.
There was 1 clothing item for Mardi Gras.