15-Minute Melee

15-Minute mode is a Multi-Man mode present in Super Smash Flash which originates from the Super Smash Bros. series. It challenges the player to defeat as many opponents as possible within 15 minutes without falling from the stage, self-destructing, or being KO'd.

In Super Smash Flash
This mode is called 15-Minute Melee, as it was called in Super Smash Bros. Melee. As with other Multi-Man modes, 15-Minute Melee is always played on and the opponents are always the Fighting Shadow Team. It is a more advanced version of 3-Minute Melee and is one of the most challenging Multi-Man modes as throughout the 15 minutes, the player can accumulate a great amount of damage and eventually be easily KO'd by a single attack. A good strategy would be wandering around, spamming attacks, or simply toying with the opponents and let the timer run out rather than actually fighting them. Unlike Melee, oppponents are always at the same level of agressiveness and "weight" and doesn't increase as the time goes on.

Though opponents are light and more prone to being KO'd, SSF physics makes them a bit harder to launch them off stage with an single attack other than an up attack or a projectile. Additionanlly, some opponents have access to different moves that allows them to recover with ease and shoot projectiles, this considerably increases the challenge.

In Super Smash Flash 2
Though Multi-Man mode is confirmed to return in Super Smash Flash 2, there is still no footage or confirmation about 15-Minute mode being included.