To activate the codes, during the game you must press the ~ (tilde) key to open the command console. After that, you can enter the cheats below:
God - God 'mode
G_fov xxx - Change the field of view, instead of xxx, enter the number you need
com_showfps 3 - Show frame rate (FPS)
Listcvars - Allows you to see all the codes, but in the regular version only immortality works
ListCmds - Command list
/ timescale xx - Change the speed of the game. Instead of x, enter the number you want: 1.0 is the default game speed; 0,8 20% slower than default; 1.2 20% faster than default
