Which stage is a simple floating platform with no obstacles, often used in competitive play?

The stage that is a simple floating platform with no obstacles, often used in competitive play, is Final Destination.

Final Destination is a recurring Super Smash Bros. stage built around a single flat platform. It has no secondary platforms, moving terrain, or stage hazards, so battles focus almost entirely on movement, spacing, attacks, recoveries, and edge-guarding. Its stark design also gives it a distinctive, abstract setting rather than tying it to a particular Nintendo game.

The stage first appeared in the original Super Smash Bros. as the arena for the final battle against Master Hand. It has returned in every mainline entry, although its size, artwork, and background have changed. In competitive play, its platformless layout can benefit characters who rely on long grounded combos or strong projectile control.

A common mix-up is Battlefield, which also has a simple central platform but adds three smaller platforms above it. Final Destination’s defining feature is precisely the absence of those extra platforms and most other obstacles.