Version 0.9b introduced Special Smash , featuring modifiers like Mini , Slow , and the chaotic Turbo Mode (inspired by Project M), which allowed players to cancel any attack on hit.

Improved hit effects, double SDI distance, and added Special Modes (Turbo). Added Silph Co., Skyward Voyage, Bowser's Castle. Super Smash Flash 2 Demo/Version 0.9b - McLeodGaming Wiki

Previous versions had broken characters (e.g., early Ichigo). Version 0.9 introduced regular balance patches (via subsequent 0.9a, 0.9b hotfixes) that toned down infinites and overpowered projectiles. The community began organizing small tournaments.

Jigglypuff took Captain Falcon's place as the version's secret unlockable fighter. Iconic New Stages