While combos of some sort are relatively common; zero-to-death combos require almost perfect timing and placement in order to properly work, and even a single missed or mistimied hitbox can ruin a combo. A zero-to-death combo was hard to pull off or impossible to perform in Super Smash Flash due to how hard it was or impossible to combo due to the high knockback that the attacks dealt and as well characters were most likely able to survive due to them being able to recover back to the stage. It is much easier, although still difficult, to perform a zero-to-death combo in Super Smash Flash 2 due to the improved physics.