To play Nuclear Day, use WASD keys to move your character through the wasteland on a PC, or use on-screen joystick controls on mobile devices. Interact with objects, NPCs, or doors by clicking the mouse or tapping the screen. Open your inventory with the designated key (often “I”) or menu button to manage resources, craft items like tools or food, and equip gear. Engage enemies using stealth or combat by clicking to attack or using crafted weapons. Follow quest objectives displayed on-screen to progress the story, such as scavenging supplies or helping survivors. Save progress at shelters to recover and re-equip. The game supports fullscreen mode and is playable on browsers or mobile devices via the CrazyGames app. Strategize resource use and moral choices to survive and escape the city.