From SmashWiki, the Super Smash Bros. wiki
Battlefield (戦場, Battlefield) is a stage in both the Nintendo 3DS and Wii U versions of Super Smash Bros. 4. It was the very first stage revealed for both games during the Nintendo Direct of E3 2013. A bigger version, Big Battlefield, is also available in Super Smash Bros. for Wii U only.
In Super Smash Bros. for Nintendo 3DS, Duck Hunt are fought here for their unlocking battle, despite their home stage of the same name being added to the game as free downloadable content in update 1.1.1.
Like its predecessors, Battlefield consists of a central, solid platform, with ledges at its sides that can be grabbed. Above this platform, there are three more soft platforms, arranged in a triangular layout. In the same manner as the Battlefield stage in Super Smash Bros. Brawl, the background shifts between the time of day, to show a dawn, day, evening and night appearance.
Visually, Battlefield differs between the two versions. In Super Smash Bros. for Nintendo 3DS, there are trees, a floating archway with stairs, and pillars of rock. The stage houses a pool of water, which drains off the front of the stage. In Super Smash Bros. for Wii U, the stage is surrounded by floating islands with ruins.
For Battlefield's Ω form, the soft platforms are removed, and the length of the stage is increased slightly to match that of Final Destination. The time change cycle is still present.
Wii U Images