Successfully complete the game, and save when prompted to unlock the Hard difficulty for skirmishes; all storyline missions; "Music" option to listen to music from the game; "Statistics" option to view the rank earned for a particular mission and the number of turns it was completed; and the ability to skip the intermission sequences. Additionally, start a new session with your cleared saved game file to retain the experience, levels, money, orders, upgrades, and weapons earned during your previous session.