During the game press ~ to open the console, then type:

g_fly 1 - fly mode on
g_fly 0 - fly mode off
fly - fly mode
gotoroom roomXX- select room UU(for example gotoroom room01)
cl_showinfo 1 - show FPS on
cl_showinfo 0 - show FPS off
hitpoints 10000 - 
g_noclip 1 - clip though wall (if fly mode is on)
game_godmode %d - god mode on, %d - current health value
game_godmode 0 - god mode off
addwpn ? - weapons list
addwpn %d - add weapon number from weapons list or full reload weapon
suicide - self suicide
save %s - save game with name %s
load %s - load game with name %s
map %s - load map %s (see map list in dir Areas)
exit - fast exit to Windows.
--------------------------------------------
Select room:
During the game hit tilde then type gotoroom roomXX (where XX is a number).

Show FPS on:
During the game hit tilde then type cl_showinfo 1.

Show FPS off:
During the game hit tilde then type cl_showinfo 0.

Fly mode on:
During the game hit tilde then type g_fly 1

Fly mode off:
During the game hit tilde then type g_fly 0.

Set hit points:
During the game hit tilde then type hitpoints.

Clip though wall:
During the game hit tilde then type g_noclip 1.

God mode on:
During the game hit tilde then type game_godmode.

God mode off:
During the game hit tilde then type game_godmode 0.

Weapons list:
During the game hit tilde then type addwpn ?.

Load map:
During the game hit tilde then type map. (refer to map list in dir areas)

--------------------------------------------
US version cheats:
When playing the game hit ` to bring down console and type in these cheats:
g_debugcmdproc_flag
g_sptimer
g_autosave
g_stickyclient
g_dontrewriteconfig
g_developer
g_printgroundnormal
g_loadmap
g_spectarors_only
g_noclip 1 - go throu walls
g_fly 1 - fly mode on
g_fly 0 - fly mode off
g_userconfig
g_writedemotofig
g_superman
g_configname
g_paused
game_godmode 100 - gives health to 100
game_godmode 0 - god mode off
game_levelresult
gotoroom room01 - goto room01 room02 etc..
w_showaxis
w_lodend
w_lodstart
w_nolod
snd_on
changemode
say
shutdown
ping_servers
connect
cl_showinfo 1 - FPS on
cl_showinfo 0 - FPS off
begin
loadall
detchbaselines
fetchsound
fetcjmodel
fetchdata
fetchvars
fly - you fly
disconnect
disconnect_this_client
new
svmap
load
save
suicide
nextmap
net_stats_reset
net_stats
maintenance_pwd
changemode
map - (mapname)
demo_stop
demo_play
demo_record
demo_record_stop
show_sounds
strictalias
delayqueue
dumpvars
hitpoints 10000
sbind
delvar
addvar
addwpn ? - gives weapon list
addwpn . - where . is add weapon number
unbindall
print
exit
list
set
(c)MMDoX