Ys vs. Trails in the Sky: Alternative Saga is a 2010 crossover fighting game developed and published by Nihon Falcom. Similar to the concept of Super Smash Bros. and Dissidia Final Fantasy, the game involves players choosing a character and participating in up to four-player fights against other characters sourced from Falcom's Ys and Trails role-playing game series. It released only in Japan for the PlayStation Portable on July 29.