In the game of Lines and Boxes, players take turns joining two horizontally or vertically adjacent lines until a player completes the forth side of the square (a box). When all boxes have been coloured, the game ends and the player who has coloured more boxes wins.
The massive asteroid that hit along the Yucatan Peninsula caused the Earth's land masses to split in to two super continents separated by giant oceans. The dinosaurs on one continent, continuing dinosaur like activities while ever evolving. The second land mass, a continent of therapsids evolving into the new species of mammals... both continents, none the wiser.
Humanities attempts to expand into the Solar System did not result in the noble unity promised. The wealthy nations of Earth continued their self-serving ways, mining the Solar System to near depletion while plummeting Earth into its bloodiest conflict. As Earth fell, the Solar System fell into anarchy, with the first and last starships being destroyed. Close to extinction, the last of humanity built the "Arc", humanities colony ship tasked with the care and oversight of all aspects of colonisation outside of the Solar System.