Apollo is focused on space exploration. It is a 2D tile based Choose Your Own Adventure game with a randomly generated map and encounters. Because of the random elements, this game can be played over and over again, and it will never be exactly the same story. You are an explorer/space cartographer sent from your home planet to map out unknown regions of space and search for an suitable area for colonization. You may encounter a variety of people, places, or things in your travels.
By moving across the map, you will trigger different encounters. If you survive the encounter, you will continue on until you have explored everything on the map. However, if you die, you must start over with a completely different map. Clicking the mouse is the only thing necessary to playing the game.