Smashing
Combat is fast, satisfying, and varied. While each character has a limited number of moves, they all feel unique and apply to very different situations.
All the Warriors
This is the biggest Super Smash Bros. roster yet. In fact, it might be the biggest fighting game roster ever (not counting homebrew Mugen games). This is not the full character select screen.
New Fighters
Super Smash Bros. Ultimate introduces King K. Rool (Donkey Kong Country), Incineroar (Pokemon), Inkling (Splatoon), Isabelle (Animal Crossing), Richter and Simon Belmont (Castlevania), and Ridley (Metroid).
Battle Arenas
Battle Arenas are waiting rooms for up to eight players, where matches rotate between them. They can be one-on-one, two-on-two team battles, or three- or four-player free-for-all fights, with different rules for which players get shuffled out of the match so someone who's been waiting can join the next one.
World of Light
World of Light is a massive single-player campaign for Super Smash Bros. Ultimate that can easily last 12 to 20 hours.
Modifiers
The World of Light mode takes the form of hundreds of different battles scattered across a giant map that looks like a patchwork of different video game locations. Here, you'll fight spirits controlling characters in the game, often with different variables affecting each match.
Fighting Spirits
You recruit every spirit you beat and can equip them to give yourself new powers and abilities.
Spirits
You can find spirits from the famous (Metal Gear REX from Metal Gear Solid) to the incredibly obscure (Yakuman Player, the box art from the Japan-only Game Boy mahjong game Yakuman).