Paradox Shop Space

You are one of the children of the worlds first timetravel scientist, "Doc". Seeking a successor for his work Doc sends you and your siblings back in time to compete against each other in a cruel test. Your task, to change the past so that only you are born, and sentence your siblings to be lost in time. You will use a range of timetravel devices to change the past, create new timelines and introduce crippling paradoxes. Who will become the victor and the first time lord?