Zero Time Dilemma is a visual novel adventure video game in development by Spike Chunsoft for Nintendo 3DS and PlayStation Vita. It is planned to be released by Aksys Games in North America and Europe in 2016. The game is the third entry in the Zero Escape series, following Nine Hours, Nine Persons, Nine Doors and Virtue's Last Reward, and is being directed and written by series creator Kotaro Uchikoshi.
Uchikoshi had started planning the game's story in 2012, but its development was put on indefinite hiatus due to the commercial failure of the series in Japan. Development was later announced in 2015 to have resumed in response to high demand from the series' fan base. The game is intended to be the final entry in the series; its story is set between the previous two games and will resolve all remaining mysteries from Virtue's Last Reward.
In the fictional chronology of the Zero Escape series, Zero Time Dilemma is set between the events of Nine Hours, Nine Persons, Nine Doors and Virtue's Last Reward. The setting is inside a facility intended to test the logistics of a Mars colony, and the psychology of the people living within the enclosed colony.
Anyone who is just as hyped for this as me? :$All of them... All six billion... Soon, I will have killed six billion people."
— Diana to the Operator, about the dire situation in the facility
Nine people have been sent to the Mars Mission Test Site to simulate a manned mission to Mars, and experiment if life is suitable there. On December 31, 2028, the day the simulation was going to end, an unknown group hacks into an operator's video feed of the simulation and releases Radical-6 into the facility. All but 3 people die, the survivors being a woman (Diana) and two other unknown people. The woman contacts the operator, ominously saying that she killed 6 people, and will kill 6 billion more people. This is presumably when Radical-6 escapes from the facility.
It is up to the Espers of Crash Keys to stop Radical-6 from escaping.
Only participant 4 has to be released yet. Who do you think they will be?