Chrono Trigger: Crimson Echoes is a fangame developed by the international team Kajar Laboratories as a ROM hack of Square‘s role-playing video game Chrono Trigger for the Super Nintendo Entertainment System. It was conceived as an unofficial installment in the Chrono series, set between the events of Chrono Trigger and its sequel Chrono Cross.
The game, as a ROM hack, runs on the Chrono Trigger game engine and has gameplay similar to the original. It is based five years after the events of Chrono Trigger and features all the playable characters from the original game, who come together across different time periods to fight an enemy attempting to change the past. The plot includes elements from both official games. Crimson Echoes concludes by setting up several plot points that were used in Chrono Cross.