Ambush
An ambush is the action of multiple enemies from the Subspace Army appearing in a level of Super Smash Bros. Brawl's Adventure Mode: The Subspace Emissary, blocking the path. They all have to be fought in order to proceed in the level. It are usually around 10 enemies that have to be fought, though it may be more, as can be seen at some points where 20 or 30 enemies have to be fought in the Midair Stadium, Battlefield Fortress, The Canyon, a flying platform (which is seen being guarded by only a few Primid, although more enemies appear here) and Subspace Bomb Factory, though that are mostly traps which complete the level, or a part of it, as opposed to only making the path clear like in normal ambushes.
Ambushes appear in all levels of the SSE.