Stuff packs are add-ons that intend to add only new items (usually in the amount of 60) to the base game. However, some releases include certain gameplay elements introduced in previous expansion packs. There are eight stuff packs so far with a ninth one to be released in November 2008. The Sims 2: Holiday Party Pack served as the pilot release for this line of products, which were called "booster packs". After the success of the pilot release, EA named the releases "stuff packs" and launched the line with The Sims 2: Family Fun Stuff.