IZOLAT

In 1983 a satellite mistook sunlight on the clouds for missiles. Forty-eight hours later the sky went dark.

1. A sealed research facility 600 metres beneath the Ural Mountains. Five people and a two-year-old child. The filters are running out, the reactor is running hot, and for the first time in nine years there is a voice on the radio.

You are the facility's terminal operator. All you have is a keyboard and a green phosphor screen.

• ENTIRELY TEXT: No graphics. Files, mail, logs and signals. You play by typing commands into an authentic 1980s terminal: ls, cat, mail, edit, comms… • EVERY COMMAND COSTS TIME: Time only moves when you act. You allocate the oxygen, water, power and rations. • SECRETS IN LAYERS: Encrypted telexes, deleted files, Morse code, archive tapes. No one tells you the truth; you work it out. • THE ONLY ONE WHO GOES UP: Guide scout Saar step by step across a radioactive snowfield. • FIVE ENDINGS: Your choices, whom you trust and what you read change the ending. One is hidden. • SHORTWAVE RADIO: Tune in to stations that only broadcast at 03:00. • GAME CENTER: 37 achievements, some of them secret. • EXTRA TERMINAL GAMES (optional purchase): ASCII chess against Viktor, live Morse with ghost stations, tic-tac-toe, Geiger Sapper and Code Breaker. • Turkish, English, German, Russian, Italian and Spanish. Built for iPhone and iPad. Playable offline.

The game is free to play and contains ads. A one-time purchase removes them.

Breath to breath. Keep it warm.