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  Portal 2 [cheats]
Alternate Title Screen:
Complete the game to unlock an alternate title screen.

Super 8 Themed Level:
On the PC/Mac versions of the game, there is a bonus level available from the Extras menu called "Super 8," a playable level based on Spielberg's movie Super 8.

Steam achievements:

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.

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