December 7 is the fifth anniversary of Super Smash Bros. Ultimate, the massive platform fighting game which includes characters from and references to dozens of gaming’s top franchises. Nintendo is marking the occasion with a special five-day Spirit Event starting today, as well as the addition of new Spirits beginning next month.
The spirit event runs until December 12, and it will offer five times the amount of EXP and SP (Spirit Points) and five extra Snack items for each battle.

Nintendo has also announced that new Spirits will be coming to the game through four new Spirit Events beginning in January. No information on the themes of the events or the Spirits being added were revealed.
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Source: Gamespot