Phycannon_minforce # - replace '#' with a number to set the grav guns lowest force power. Phycannon_maxmass # - replace '#' with a number to set how big the objects the grav gun picks up can be
Phycannon_pullforce # - replace '#' with a number to set the force of object pull with gravity gun Mat_fullbright 1 - you can see everything without using the flashlight Noclip - walk through walls, people, ect.
First click on hl2 shortcut properties and add the line '-console' and apply next play the game and when you can move A.K.A no cutscenens or menus press '~' button and type in any code listed.