Programing

My plan is to start working on a game that has no limit, that is open world, comunity based and is free! I want it to be awesome... I want it to be MULTIPLATFORM so all players around the world no matter what OS they have they can play the game! I want  it to be with no additional fees, no REAL MONEY to buy INGAME STUFF, i am planning to make it open world so players are not limited but they can create new cityes/planets/galaxyes! SHORT GAME DESCRIPTION: Your imagination will be your limit!