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• Alternate title screen

Successfully complete the game.

• Bonus store items

Complete the indicated task to unlock the corresponding item for purchase at the store.

Bionic Beanie: Complete "Lunacy".
WCC Flag: Complete "High Five".

• Portal 2 console on PC and enter commands

From the main menu, go to Options -> KEYBOARD/MOUSE -> Allow Developer Console and set it to Enabled. Note: to make some of these codes work, you need to enter this code into the console: sv_cheats 1.

Effect	Code
Changes speed of game, 0.1 = 10% of original game speed, 2 = twice the original game speed	host_timescale # (default=1).
Changes view to first person	firstperson.
Changes view to third person	thirdperson.
Creates a Companion Cube	ent_create_portal_companion_cube.
Creates a reflector cube for lasers	ent_create_portal_reflector_cube.
Invincibility	god.
Lets you change the gravity in the game	sv_gravity # (600=normal).
Lets you go through walls and fly around	noclip.
Place portals anywhere	sv_portal_placement_never_fail # (1 or 0).
Player can take damage but won't die	buddha.
Shoots conversion gel out of your face	ent_create_paint_bomb_portal.
Shoots propulsion gel out of your face	ent_create_paint_bomb_speed.
Shoots repulsion gel out of your face	ent_create_paint_bomb_jump.
Shoots water out of your face	ent_create_paint_bomb_erase.
Shows FPS Rate	cl_showfps 1.
Turns Cheats on/off	sv_cheats (0=off/1=on).
Turrets won't shoot at you	notarget.

• Singing Turrets

In test chamber 16, there is a turret inside a ventilation grate right past the elevator. Jump over it, get the refraction cube and use the laser to destroy that turret. The grate will open up, and when you go in, there will be 4 turrets singing a song in unison.

• Various Steam Achievements

Complete the following tasks to unlock the corresponding achievement. To view your achievements and stats in Steam, select "Community", then "My profile", then "View all my games", then the game and view stats.

Achievement	How to unlock
Air Show	Perform 2 aerial gestures before touching the ground in co-op.
Asking for Trouble	Taunt GLaDOS in front of a camera in each of the five co-op courses.
Bridge Building	Complete all test chambers in the Hard-Light Surfaces co-op course.
Bridge Over Troubling Water	Complete the first Hard Light Bridge test.
Can't Touch This	Dance in front of a turret blocked by a hard light bridge in co-op.
Confidence Building	Complete all test chambers in the Mass and Velocity co-op course.
Door Prize	Examine all the vitrified test chamber doors.
Drop Box	Place a cube on a button without touching the cube.
Dual Pit Experiment	Do the same test twice.
Empty Gesture	Drop your co-op partner in goo while they are gesturing by removing the bridge under them.
Final Transmission	Find the hidden signal in one of the Rat Man's dens.
Four Ring Circus	Enter 4 different portals without touching the ground in co-op.
Friends List with Benefits	While playing co-op, hug 3 different people on your friends list.
Gesticul-8	Perform all 8 gestures of your own volition in co-op.
Good listener	Take GLaDOS' escape advice.
High Five	Celebrate your cooperative calibration success.
Iron Grip	Never lose a cube in Chamber 6 of the Mass and Velocity co-op course.
Lunacy	That just happened.
Narbacular Drop	Place a portal under your co-op partner while they are gesturing.
No Hard Feelings	Save a turret from redemption.
Obstacle Building	Complete all test chambers in the Excursion Funnels co-op course.
Overclocker	Complete Test Chamber 10 in 70 seconds.
Party of Three	Find the hidden companion cube in co-op test chamber.
Pit Boss	Show that pit who's boss.
Portal Conservation Society	Complete Chamber 3 in the Hard-Light Surfaces co-op course using only 5 total portal placements.
Portrait of a Lady	Find a hidden portrait.
Preservation of Mass	Break the rules in Test Chamber 07.
Professor Portal	After completing co-op, complete Calibration Course online with a friend who hasn't played before.
Pturretdactyl	Use an Aerial Faith Plate to launch a turret.
Rock Portal Scissors	Win 3 co-op games of rock-paper-scissors in a row.
SaBOTour	Make a break for it.
Scanned Alone	Stand in a defective turret detector.
Schrodinger's Catch	Catch a blue-painted box before it touches the ground.
Ship Overboard	Discover the missing experiment.
Smash TV	Break 11 test chamber monitors.
Stalemate Associate	Press the button!.
Still Alive	Complete Course 4 with neither you nor your co-op partner dying.
Stranger Than Friction	Master the Propulsion Gel.
Tater Tote	Carry science forward.
Team Building	Complete all test chambers in the Team Building co-op course.
The Part Where He Kills You	This is that part.
Triple Crown	Solve 3 co-op chambers in the Mass and Velocity course in under 60 seconds each.
Tunnel of Funnel	Master the Excursion Funnel.
Vertically Unchallenged	Master the Repulsion Gel.
Wake Up Call	Survive the manual override.
White Out	Complete the first Conversion Gel test.
You Made Your Point	Refuse to solve the first test in Chapter 8.
You Monster	Reunite with GLaDOS.
You Saved Science	Complete all test chambers in all courses of co-op.

• More Cheat Codes for Portal 2!

More Portal 2 Cheat Codes @ CheatListings
More Portal 2 Cheat Codes @ AbsolutCheats