In the "Choose Destination" screen in orbit (i.e. the map with missions) if you hover over a mission/raid it tells you that you can either press "X" to continue or press "SQUARE" to reset it. However, doing so on the map screen ONLY resets the LOWEST difficulty of that mission/raid. So if you are trying to reset Hard Mode VoG/Crotas End or any heroic mission, it will not work. [b]The way to actually reset the checkpoints on a harder difficulty is to choose the mission like normal on the map screen, and then when you would normally press "X" to select a different difficulty, press "SQUARE" on that difficulty instead.[/b] You will know the reset has worked if you get a confirmation screen after you hit Launch. If you hover over it, you'll see that it actually doesn't say you can do this, but it works. This is especially important for those "heroic or harder" kill bounties like in the Black Garden mission where the target hydra won't spawn if you have too far of a checkpoint. [quote]TL;DR: When trying to restart a lvl 26 or whatever heroic mission, you have to hit "SQUARE" on the difficulty selection screen, not on the map screen. When doing it on the map screen it only resets the easiest difficulty. Works the same way for raid difficulties.[/quote]