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* Guard against maps with corrupt mark surfaces, caused by some external tools

* Place the other portal onto the '''X''' mark that can be found above you. The [[High Energy Pellet|Energy Pellet]] is hi ...Energy Pellet|Energy Pellet]] and place the other portal onto the '''X''' mark on the ceiling.

| Mark Bremer¹

* Place the portal you just came through on the scorch mark left by the High Energy Pellet.

* By using the portal gun, place one of the portals on the '''''X''''' mark that's above the [[Turret]] and the other portal onto the walls or the floo

...t filled with conveyor belts and house wares. Grady introduces them to the Mark III turret, a much stabler and more controllable turret. After testing the {{Spoiler|Finishing the testing of the Mark III, Grady excitedly tells the player that they are going to present the co

...r the lift was accurately set, you won't have to let the pellet bounce and mark the wall for you before positioning your portal. Wait again for the pellet

...cle". The gap lengthens past the bottom of the screen. A white exclamation mark briefly appears above the test subject.'']

...cle". The gap lengthens past the bottom of the screen. A white exclamation mark briefly appears above the test subject.'']

...cle". The gap lengthens past the bottom of the screen. A white exclamation mark briefly appears above the test subject.'']

...ure. Any contact with the chamber floor will result in an 'unsatisfactory' mark on your official testing record followed by death. Good luck!)]]

...02_turrettrap_nags05.wav|"You know, I'd tell you if I were dead. Courtesy. Mark of a civil society. So, just let me know."]]

...ion. Also pass auf, damit dir nichts Schlimmes passiert, bevor ich dir das Mark aus den Knochen ziehe."]]

...ure. Any contact with the chamber floor will result in an 'unsatisfactory' mark on your official testing record followed by death. Good luck!"]]