Twelve Minutes takes place on a single game save. It cannot be saved manually, but progress is saved with each full loop.
If you want to start the adventure over, whether it's because you missed certain dialogues or reactions of characters you can't get to know anymore, you can reset your progress. This will also be required if you want to get all the achievements. There is no button start a new game button in the game, so in order to to reset the progress, you have to:
- Open the menu and enter game options,
- Open the advanced tab,
- Click the delete progress button.
This will reset the game state to default beginning. You must use this function at least 2 times to unlock endings and achievements.