Classic

Classic mode is a 1 player mode along with the Adventure Mode and All-Star Mode in Super Smash Flash and Super Smash Flash 2, where you fight the characters in a series of levels, and in different stages. In Super Smash Flash, there are 2 bonus stage, one called Break the Targets, and the other Race to the Finish. In the sequel, there will be other bonus stages along these two. Only Break the Targets can be played separate to the Classic Mode. The final stage is always a fight with Master Hand in the Final Destination stage.

In Super Smash Flash
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In Super Smash Flash 2
As of the 1/25/15 McLeodGaming Direct, Classic Mode was confirmed.