Complete the game. Go back to the Blackfoot Territory (first area in the game). Locate the higher boulder
that leads up to a ledge and a gap. While on a horse at the left side of the boulder, jump and use your
spurs until you land on top of the boulder. Then, get onto the ledge, ride across the next two areas. Then
stop between the two rocks in the water. hold LT + RT + A until the confirmation sound is played. Press
Start to enter the options screen and a new option named "Gun" will appear. Once selected, you can
replay any main mission or side mission, view the intermission sequences, and toggle the help messages.