
You will know if you are playing on Hardcore if you no longer have the option to restart checkpoints or lower the difficulty. Once you've completed the game on hard, start a new campaign on Hardcore. Hardcore difficulty is only unlocked after first completing the campaign on hard difficulty. Step 2 (Complete the campaign on the Hardcore difficulty setting):

You will need to complete the campaign on the hard difficulty setting in order to unlock the Tier 1 and Hardcore difficulties. Step 1 (Play through the campaign on Hard): An online version did exist but has now been withdrawn.
MOH WARFIGHTER COMBAT TRAINING MANUAL
Like with many recent games, Warfighter forgoes including a game manual in the case. While online you can choose to play as a member of over a dozen real-life highly skilled international fire teams in the fast paced competitive team-based multiplayer modes. During the campaign you will play as and alongside the elite Tier 1 force while completing missions inspired by real-life counter-terror operations. Warfighter was written by actual Tier 1 military Operatives. This modern military shooter isn't only about what current soldiers are up against, it also reminds you of what they're fighting for. Warfighter is a direct sequel the 2010 reboot Medal of Honor and is only the second Medal of Honor game set during modern day warfare.

Medal of Honor: Warfighter is 14th instalment of the venerable FPS series. Does difficulty affect any trophies: Yes (campaign must be completed on Hard, Hardcore and Tier 1) Glitched trophies: "Back in the Fight" & "Brothers in Arms" Neither are common but they do sometimes occur. Number of missable trophies: None (Mission Select) Minimum number of playthroughs needed: 2 + an additional playthrough of the last level on Tier 1 Approximate amount of time to ?: Single player - 15 hours, Online - 20+ hours Estimated trophy difficulty: 6.5 as per the MOH: Warfighter Platinum Rating Thread
