Like in previous games in the series, Super Smash Bros. is a multiplayer platform fighter where players use various attacks, techniques, and items to deal damage to their opponents and knock them out of the arena. As a character's damage percentage increases, they fly back further when attacked, and may eventually be knocked far enough out of the playing field to be knocked out. To assist players during a battle, items sometimes appear on the battlefield, most of which represent the various video games represented in the series. An item called a Smash Ball allows players to use a powerful, character-specific attack known as a "Final Smash".[2] Another item is an Assist Trophy, which summons various non-playable characters from a represented series onto the field to assist the summoner.[3][4] Like its predecessors, Super Smash Bros. features collectible in-game trophies based on characters or items seen in various Nintendo or third-party games.[5] Each stage now features an alternate Omega form, which replaces the stage's layout with a flat surface with ledges on both sides and removes all stage hazards, similar to the stage "Final Destination", a flat, medium-sized stage with no hazards.[6] Certain stages, collectible trophies, and game features are exclusive to each version, with the Wii U version primarily featuring elements taken from home console titles and the 3DS version taking elements primarily from handheld titles. Both games feature revisited stages from past entries in the series and new stages representing newly introduced properties or recent entries in existing ones.[