编辑“︁Potato Sack”︁（章节）

=== 三轮更新 ===
[[File:The Ball - The Potato Sack.jpg|thumb|upright=1.3|第三轮更新中，{{le|Teotl Studios|Teotl Studios}}在他们的游戏《球》的玛雅风格关卡中加入《传送门》主题关卡设计。]] 
4月12日，每个更新又收到另一轮更新。这番更新都是《传送门》主题的，例如《球》和《杀戮空间》中取材自光圈科技的关卡<ref>{{cite web | url = http://www.gamasutra.com/view/news/34081/Portal_2_ARG_Introduces_New_Themed_Content_In_Indie_Game_Updates.php | title = Portal 2 ARG Introduces New Themed Content In Indie Game Updates | publisher = Gamasutra | first = Kyle | last = Orland | date = 2011-04-12 | accessdate = 2011-04-12 | archive-date = 2011-04-14 | archive-url = https://web.archive.org/web/20110414102435/http://www.gamasutra.com/view/news/34081/Portal_2_ARG_Introduces_New_Themed_Content_In_Indie_Game_Updates.php | dead-url = no }}</ref>。完成新内容的特定关卡，玩家再度来到光圈科技屏幕前，而这次屏幕提供了一条加密的线索音频。该线索分成两段，和此前在西雅图被发现的地点有关。在地图上标出这些点，利用线索中一般会出现的地点，玩家找到Steam一个的小组名字，这个小组有个组员叫“恐龙”，这个名字在游戏早期被用来公布《传送门2》。这名用户档案出现了一个指向在2011年4月15日到期的倒计时的[[二维码]]截图。玩家发现这些音频线索，在Steam档案中获得一个马铃薯。有待发现的马铃薯共有36个，35个在游戏和被提到的Steam小组中，剩下一个在另外35个被找到后会出现<ref name="gamasutra arg"/>。

在这些更改出现的同时，《传送门2》可以在Steam客户端中预加载。于是，记者和玩家纷纷怀疑《传送门2》在倒计时结束时已经提前解锁。这和内维尔给许多游戏网站发去的单独嵌入谜题的信息吻合，该消息暗示材料“提早发布”和“十三个场外房间”，似乎指独立游戏和消息“4/19/2011 7 AM == 4/15/2011 9 AM”，再次指《传送门2》的计划发售日和倒计时<ref>{{cite web | url = http://www.escapistmagazine.com/news/view/109125-Gabe-Newell-Sends-Out-Portal-2-ARG-Email-Blast | title = Gabe Newell Sends Out Portal 2 ARG Email Blast | first = Tom | last = Goldman | date = 2011-04-09 | accessdate = 2011-04-09 | publisher = The Escapist | archive-date = 2011-04-11 | archive-url = https://web.archive.org/web/20110411203114/http://www.escapistmagazine.com/news/view/109125-Gabe-Newell-Sends-Out-Portal-2-ARG-Email-Blast | dead-url = no }}</ref><ref name="Schreier">{{Cite web | url = https://www.wired.com/gamelife/2011/04/portal-2-early-launch/ | title = Play Steam Games, Launch Portal 2 Early | first = Jason | last = Schreier | date = 2011-04-15 | accessdate = 2011-04-15 | work = Wired | archive-date = 2011-04-18 | archive-url = https://web.archive.org/web/20110418184148/http://www.wired.com/gamelife/2011/04/portal-2-early-launch | dead-url = no }}</ref><ref>{{cite web | url = http://www.metro.co.uk/tech/games/860768-portal-2-to-get-early-release-on-steam | title = Portal 2 to get early release on Steam? | date = 2011-04-13 | accessdate = 2011-04-13 | first = Tom | last = Phillips | work = The Metro | archive-date = 2011-04-17 | archive-url = https://web.archive.org/web/20110417014518/http://www.metro.co.uk/tech/games/860768-portal-2-to-get-early-release-on-steam | dead-url = no }}</ref><ref>{{cite web | url = http://www.pcgamer.com/2011/04/13/portal-2-levels-appear-in-potato-sack-games-clues-suggest-portal-2-could-be-released-early/ | title = Portal 2 levels appear in potato sack games, clues suggest Portal 2 could be released early | first = Tom | last = Senior | date = 2011-04-13 | accessdate = 2011-04-13 | work = PC Gamer | archive-date = 2011-04-16 | archive-url = https://web.archive.org/web/20110416053452/http://www.pcgamer.com/2011/04/13/portal-2-levels-appear-in-potato-sack-games-clues-suggest-portal-2-could-be-released-early | dead-url = no }}</ref>。随着4月15日的日益临近，约9名狂热玩家疑似退出各种聊天室，留下“天空有一个我可以飞出去的洞”——《传送门》早期宣传用过的标语。其他玩家找到他们时，他们对自己的行为保持神秘，表现腼腆，仿佛被GLaDOS“感染”<ref>{{cite web | url = http://www.pcgamer.com/2011/04/14/glados-hacking-arg-player-accounts-ominous-messages-emerge/ | title = Glados hacking ARG player accounts, ominous messages emerge | first = Tom | last = Senior | date = 2011-04-14 | accessdate = 2011-04-29 | work = PC Gamer | archive-date = 2011-05-01 | archive-url = https://web.archive.org/web/20110501162548/http://www.pcgamer.com/2011/04/14/glados-hacking-arg-player-accounts-ominous-messages-emerge/ | dead-url = no }}</ref>。后来据透露，威尔乌在几天前接触他们，邀请他们到总部提前试玩《传送门2》<ref name="gamasutra arg"/>。