Explore strange new worlds, weed out alien life and civilizations and boldly press buttons that no one has pressed before. Classic cosmic journey stuff.
Do well enough and your name will be remembered forever (or for six months to be more precise).
A sliding puzzle played with 15 blocks on a 4x4 grid. Arrange the blocks in ascending order to win the puzzle. Try to solve it in the least number of moves, like these people did.