半条命2还没有正式发布之前，作弊码就已经先行从互联网上流出，半条命2作弊首先要在桌面半条命2的快捷方式上添加"-console"这个命令行参数，"C:Program FilesHalf-Life 2hl2.exe" -console。然后进入游戏，按“～”呼出控制台，就可以输入以下作弊代码：
god - God mode (server side only)
give - Gives a weapon or an item (see the list below)
buddha - Reduces your health
hurtme # - Hurts the player (# is damage amount)
impulse 101- All weapons
impulse 82 - Spawns a jeep
notarget - Player becomes hidden to NPCs
noclip - Walk through walls (server side only)
maps - Displays map list
map - Load a specified map (see the list below)
developer # - Sets developer mode to on/off/verbose (0-off, 1-on, 2-verbose)
+mlook - Enables mouse look
hud_quickhelp/text? 1 - Shows crosshair
viewmodel_fov # - Sets the size of the weapon you’re carrying (54 is default)
exec - Execute a script file
cl_drawhud 1 - Turns hud display on
cl_enablehud 1 - Turns hud display on
cl_showfps 1 - Shows frames per second in game
npc_create - Creates an NPC (works in worlds that have an NPC entity)
npc_create_aimed - Creates an NPC aiming away from the player.
picker - Toggles ’picker’ mode.
setpos - Move player to specified origin (must have sv_cheats 1 enabled).
setang - Snap player eyes to specified pitch yaw (musthave sv_cheats).
sv_gravity # - Set gravity to #
sv_stopspeed # - Set minimum stopping speed when on ground to #
sv_friction # - Sets world friction to #
sv_bounce # - Sets bounce multiplier for physically simulated objects collision
sv_maxvelocity # - Sets the maximum velocity of any moving object to #
sv_waterdist # - Sets vertical view fixup when eyes are near water plane to #
air_density # - Changes the density of air to #
dsp_explosion_effect_duration # - Sets length of confusion/ear-ringing effect to #
prop_debug - Toggle bounding-boxes debug mode on/off (red - ignore damage, white - respond to damage, green - health)
sv_soundemitter_filecheck - Toggle reporting missing .wav files for sounds
mat_numtextureunits # - Limits the number of texture units to # (0 - let the game decide how many texture units to use)
mat_yuv 0 - ?
另外，今天网上也泄漏出半条命2常用的一些命令行参数：
-r_anamorphic 0
-netgraph 3
-mat_preloadshaders
-preload
-console
-dx9
-fullscreen
-width 1024 -height 768
-heapsize 80000
-dxlevel 90
-shaderdll shader_nvfx_ps20.dll
-mouselook
-dx8
-condebug
-sw
-startwindowed
-window
-windowed
