Feeling rather sheepish, but i can't seem to save my single player game. Playing on x-box 360. I press the "start" button as suggested and the "save game" option does not present itself. Not a demo. can someone please help, it's getting to be past my bedtime.

When you booted earlier did it have you select your storage device? If you cancelled out of that that will not let you save.

Also if you're playing the "Game of the Week" you can't save it. Regular games are definitely save-able though. For a regular game if you hit the start menu, you should see a list of menu items "Show Controller Map", "Save the Game", "Load a Saved Game", "Change Options", and "Exit to the Main Menu". If you're playing Game of the Week, the "Save the Game" and "Load a Saved Game" menu items won't be listed.