Chrono Trigger is a RPG developed and published by Square (now Square Enix) for the Super Nintendo Entertainment System in 1995. The game takes place in a world familiar to Earth, with eras such as the prehistoric age, in which primitive humans and dinosaurs share the earth; the Middle Ages, replete with knights, monsters, and magic; and the post-apocalyptic future, where destitute humans and sentient robots struggle to survive. The characters frequently travel through time to obtain allies, gather equipment, and learn information to help them in their quest. The party also gains access to the End of Time (represented as year ∞), which serves as a hub to travel back to other time periods. The party eventually acquires a time-machine vehicle known as the Wings of Time, nicknamed the Epoch. The vehicle is capable of time travel between any time period without first having to travel to the End of Time. The game was later ported to the PlayStation, Nintendo DS and Smartphones.