Hi Bigun, yet the cheats system is for online paly. If you're only playing singleplayer you can install any cheat programs that may be available.
Here are a few cheats:
For Half-Life 2, Episode One and Episode Two:
All commands are done through the Console. Must be enabled through the -Console option on an shortcut to the game executable or enabled in the in game options under the Advanced section of Controls. It is then accessed by pressing the tilde key (next to numeric one on NTC keyboards, on the right side somewhere on the freak -- PAL --keyboards).
Most of these require sv_cheats to be set to 1.
upgrade_portalgun - Allows use of second portal placement. Must have obtained blue portal portion of the gun.
fire_energy_ball - Fires an energy ball that can be used in solving puzzles. Recommend that you bind this to a key for easy use. Example would be, bind q fire_energy_ball
ent_create_portal_weight_box - Creates a Weighted Storage Cube for your use in getting a little bit higher, holding down a button, or taking out a sentry.
change_portalgun_linkage_id # - Replace # with an integer from 0 to 3. Allows for creation of seperate sets of portals.
sv_portal_placement_never_bump 1 - No listed effect.
sv_portal_placement_never_fail 1 - Portals can be placed on almost any surface. They still cannot go through the dispersal fields and some curved surfaces/models.
Half Life 2, Episode 1, 2 and Portal Console Commands
Activate developers code by going to the keyboard options and clicking advance. Then when in game press the [~] button.
sv_cheats 1: Activates cheats
notarget: Enemies don't target you
noclip: fly
God: God mode
Map codes for spawning to specific areas
Enter these with the 'map' code in the console. Press ~ to activate the console.
d1_under_04: Spawn the lab chapter near the end.
d1_trainstation_03: Spawns in the train station after the second load point.
d1_trainstation_05: Spawns in the train station after the third load point.
d1_canal_09: Spawns in you in the canals after the eighth load point.
d1_canals_12: Spawns in you in the canals after the eleventh load point.
d1_canals_06: Spawns in you in the canals after the fifth load point.
d1_canals_05: Spawns in you in the canals after the fourth load point.
d1_canal_10: Spawns in you in the canals after the ninth load point.
d1_canals_03: Spawns in you in the canals after the second load point.
d1_canal_08: Spawns in you in the canals after the seventh load point.
d1_canals_07: Spawns in you in the canals after the sixth load point.
d1_canals_11: Spawns in you in the canals after the tenth load point.
d1_canals_04: Spawns in you in the canals after the third load point.
d1_canals_13: Spawns in you in the canals close to the end.
d1_eli_01: Spawns you after the canal, outside of Eli's Lab.
d3_citadel_02: Spawns you after the first load point in the Citadel.
d3_citadel_03: Spawns you after the second load point in the Citadel.
d3_citadel_04: Spawns you after the third load point in the Citadel.
d1_breen_01: Spawns you at the beginning of Chapter 13.
d3_citadel_05: Spawns you at the end of the Citadel.
d1_canals_02: Spawns you deeper in the canals.
d3_c17_09: Spawns you in City 17 after the eighth load point.
d3_c17_12: Spawns you in City 17 after the eleventh load point.
d3_c17_06: Spawns you in City 17 after the fifth load point.
d3_c17_02: Spawns you in City 17 after the first load point.
d3_c17_05: Spawns you in City 17 after the fourth load point.
d3_c17_10: Spawns you in City 17 after the ninth load point.
d3_c17_03: Spawns you in City 17 after the second load point.
d3_c17_08: Spawns you in City 17 after the seventh load point.
d3_c17_07: Spawns you in City 17 after the sixth load point.
d3_c18_11: Spawns you in City 17 after the tenth load point.
d3_c17_04: Spawns you in City 17 after the third load point.
d1_eli_02: Spawns you in Eli's Lab.
d1_under_01: Spawns you in lab d2_prison_01: Spawns you in Nova Prospekt d2_prison_06: Spawns you in Nova Prospekt after the fifth load point.
d2_prison_02: Spawns you in Nova Prospekt after the first load point.
d2_prison_03: Spawns you in Nova Prospekt after the second load point.
d2_prison_07: Spawns you in Nova Prospekt after the sixth load point.
d2_prison_04: Spawns you in Nova Prospekt after the third load point.
d2_prison_05: Spawns you in Nova Prospekt near the end of the level.
d1_town_01: Spawns you in Ravenholm d1_town_02: Spawns you in Ravenholm after the first load point area.
d1_town_03: Spawns you in Ravenholm after the second load point area.
d1_town_04: Spawns you in Ravenholm after the third load point area.
d1_canals_01: Spawns you in the canals.
d3_c17_01: Spawns you in the city 17 rebellion d2_coast_09: Spawns you in the coast area after the eighth load point.
d2_coast_06: Spawns you in the coast area after the fifth load point.
d2_coast_02: Spawns you in the coast area after the first load point.
d2_coast_05: Spawns you in the coast area after the fourth load point.
d2_coast_10: Spawns you in the coast area after the ninth load point.
d2_coast_03: Spawns you in the coast area after the second load point.
d2_coast_07: Spawns you in the coast area after the sixth load point.
d2_coast_11: Spawns you in the coast area after the tenth load point.
d2_coast_04: Spawns you in the coast area after the third load point.
d2_coast_08: Spawns you in the coast area near the end of it.
d1_under_02: Spawns you in the lab chapter after the second load point.
d1_under_03: Spawns you in the lab chapter after the third load point.
d1_trainstation_01: Spawns you in train station d1_trainstation_02: Spawns you in train station after the first load point.
d3_citadel_01: Spawns you near the beginning of the Citadel.
d3_c17_13: Spawns you near the end of City 17.
d2_prison_08: Spawns you near the end of Nova Prospekt.
d1_town_05: Spawns you near the end of Ravenholm.
d1_canals_end: Spawns you near the end of the canals.
d2_coast_12: Spawns you near the end of the coast area.
d1_trainstation_06: Spawns you near the end of the train station.
d2_coast_01: Spawns you on the coast (Vehicle) credits: Starts you at the credits intro: Starts you at the games Intro.
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The following sites may also be of use to you:
http://www.cheatscodesguides.com/xbox-360-cheats/half-life-2/
http://www.cheatcc.com/xbox360/orangeboxcheatscodes.html
http://www.cheatgenius.com/pc-cheats/the-orange-box-cheats/
Cheats are usually inputed/activated via the console which for most games is accessed using the ~ key; though they can also be installed via patches that changes the games coding. just in case they go wrong. you can then revert back to the original if necessary.
Regards
Stephen :)