Version 0.1a was the first playable version of the Super Smash Flash 2 Demo, announced on September 24, 2007 and released on December 25 the same year. It introduced the first four playable characters, Mario, Kirby, Ichigo and Lloyd, along with Test Stage 1, Test Stage 2, and Battlefield (which was referred to as "The Battlefield"). As the first primitive build of the game, there were a number of significant fundamental differences and flaws with it compared to most recent versions.