Sudden Death is a setting in the Battle Game of many Bomberman games that restricts player movement and makes the battle much more dangerous as time begins to run out. The message "Hurry Up!" appears, along with an accompanying soundbite, as Sudden Death begins.
The traditional form is Hard Blocks falling out of nowhere in a steady stream to shrink the battlefield and flatten players caught beneath them. Depending on the game, this may or may not continue until the battlefield is completely covered in blocks. In any event, Sudden Death will end once a winner has been decided (or the game has ended in a draw). The Hard Blocks usually fall in a clockwise pattern looping around the stage, starting in the upper-left, but some games have an option to randomize their drop pattern. Sudden Death generally only occurs in traditional elimination-style Battle Mode matches.
Bomberman DS has the blocks erupt from the ground row-by-row, starting from the bottom. The Hard Blocks are still lethal to players caught where they appear.
The Bomberman 64 games (Bomberman 64 and Bomberman 64: The Second Attack) use the engine of their Normal Modes for the Battle Game instead of the traditional grid-based style. As a result, their Sudden Death is a bit different. It varies depending on the arena, and can take the form of the walls closing in (swallowing up and killing players who don't retreat to the center), the arena sinking down into a deadly liquid, or fireballs raining down from the sky.
Fireballs rain down from the sky.
The arena sinks down into water.
The walls close in.
Try to stay alive in battle at this point.