I think it's safe to say he's playing San Andreas.

Here are the three ways I know of:

(1) CIRCLE, RIGHT, CIRCLE, RIGHT, LEFT, SQUARE, TRIANGLE, UP

    This will lock your wanted level, so make sure you don't
    have any stars before putting the code in. This works anytime.

(2) "No-Stars" missions - During either the entire mission, or parts
    thereof, you will not get stars when committing crimes or going
    to islands that you aren't supposed to enter yet. NOTE: the
    missile launchers will still fire at you if you fly too close to
    their areas.

    "Drive-By", given to you by Sweet. This is the earliest no-star
    mission. At the beginning of the mission, don't get in the car
    with Sweet and friends. You can run around and do whatever you
    want, and the map is still populated like normal. Ballas and
    other gangs still hate you, so be careful on their turf.

    "Reuniting the Families", also given by Sweet. Don't enter the
    hotel at the beginning of the mission. The map is 99%
    unpopulated; restaurants and stores still have people inside,
    and police officers in guard booths are still there. Also, you
    will occasionally see a ped or two on the streets, but it's very
    unlikely.