Killzone is a first-person and twin sticks shooter series of video games exclusively for Sony Computer Entertainment's (SCE) video game consoles.
 The main series and the PlayStation Portable (PSP) installment were developed by Guerrilla Games, a subsidiary of SCE, and the PlayStation Vita installment was developed by Guerrilla Cambridge in the United Kingdom.
 "Killzone" currently consists of six games spanning over the PlayStation 2, PlayStation Portable, PlayStation 3, PlayStation Vita, and the PlayStation 4.
 The series began on the PlayStation 2 in November 2004 with "Killzone", and continued on the PlayStation Portable in October 2006 with "". "
Killzone 2" was released for the PlayStation 3 in February 2009 , and "Killzone 3" was released in February 2011 , also for the PlayStation 3. ""
 was released for the PlayStation Vita in September 2013, followed by "Killzone Shadow Fall", a launch title for the PlayStation 4, in November 2013.
High Impact Games is an American video game developer based in Burbank, California, formed in 2003 by former members of Insomniac Games and Naughty Dog.
 In 2007, the company released "" for the PlayStation Portable, with a PlayStation 2 port released the next year, and "Secret Agent Clank" in 2008, also for the PlayStation Portable.
 On November 3, 2009, the company released its third game, "", for the PlayStation Portable and PlayStation 2.
 The game was based on the "Jak & Daxter" series made by Naughty Dog.
 In 2010, High Impact Games was developing a remake of Crash Team Racing for PlayStation 3, Xbox 360 and Wii, but the game was canceled by Activision before the prototype initial.
 An environmental artist, who has worked on some games, revealed that High Impact Games is working on a new project for the Wii.
 This game has been revealed to be "".
Assassin's Creed II is a 2009 action-adventure video game developed by Ubisoft Montreal and published by Ubisoft.
 It is the second major installment in the "Assassin's Creed" series, a sequel to 2007's "Assassin's Creed", and the first chapter in the "Ezio trilogy".
 The game was first released on the PlayStation 3 and Xbox 360 in November 2009, and was later made available on Microsoft Windows in March 2010 and OS X in October 2010.
 Several minor game related features could be redeemed on Uplay and three downloadable expansion packs were released on Xbox Live.
Assassin's Creed Brotherhood is a 2010 action-adventure video game developed by Ubisoft Montreal and published by Ubisoft.
 It is the third major installment in the "Assassin's Creed" series, a direct sequel to 2009's "Assassin's Creed II", and the second chapter in the 'Ezio trilogy'.
 The game was first released on the PlayStation 3 and Xbox 360 in November and December 2010, and was later made available on Microsoft Windows in March and June 2011.
Assassin's Creed: Bloodlines is an action-adventure video game for PlayStation Portable, part of the "Assassin's Creed" franchise, taking place in between the events of "Assassin's Creed" and "Assassin's Creed II".
 The game was developed by Ubisoft Montreal in conjunction with Griptonite Games and published by Ubisoft, it was released on November 17, 2009 in North America and November 20, 2009 in Europe, concurrently with "Assassin's Creed II" and "".
Assassin's Creed Rogue is an action-adventure video game developed by Ubisoft Sofia and published by Ubisoft.
 It is the seventh major installment in the "Assassin's Creed" series, and acts as a sequel to 2013's "" and a prequel to 2012's "Assassin's Creed III" with its final mission being the prologue to 2014's "Assassin's Creed Unity".
 It is the last of the "Assassin's Creed" games to be released for PlayStation 3 and Xbox 360, Ubisoft announcing that the company will no longer release games for them, except for its casual rhythm series "Just Dance".
 The game was first released for PlayStation 3 and Xbox 360 in November and December 2014, and released for Microsoft Windows on March 10, 2015.
Monster Hunter Portable 3rd (モンスターハンターポータブル3rd ) is a game in the "Monster Hunter" franchise for the PlayStation Portable system that was released in Japan on December 1, 2010.
 The game was released, as a part of the PlayStation Portable Remaster series, on PlayStation 3.
 The game introduces new regions, monsters, and a revised Felyne combat system.
 "Monster Hunter Portable 3rd" is not an update to "Monster Hunter Freedom Unite" or "Monster Hunter Tri".
 "Monster Hunter Portable 3rd" is instead separate to the rest of the series, and most of the game has been entirely remade.
 However, it is also a successor to "Monster Hunter Freedom Unite" as the third game in the Portable series.
Assassin's Creed II: Discovery is a video game for the Nintendo DS and iOS, part of the "Assassin's Creed" series of video games.
 Ubisoft's producer Ben Mattes officially revealed the development of the game in Apple Inc.'s keynote speech on September 9, 2009, for a November 17 release.
 The iOS version was delayed, but Ubisoft did not comment with a reason for the delay.
 In contrast to "", the previous title in the "Assassin's Creed" series to be on these devices, "Discovery" is a 2.5D side-scroller.
 Both iPhone and DSi users are able to use their devices' camera function to display portraits as wanted posters in-game.
 "Discovery" was released concurrently with "Assassin's Creed II" and "".
 The game takes place within "Assassin's Creed II" between The Battle of Forli DLC in Sequence 12 and Bonfire of the Vanities DLC in Sequence 13.
Legendary Wings (アレスの翼 , Aresu no Tsubasa , ""The Wings of Ares"") is a fantasy-themed shoot-'em-up game released by Capcom as a coin-operated video game in 1986 .
 The player takes control of a young soldier equipped with magical wings who must save the world from a malfunctioning supercomputer.
 A home version for the Nintendo Entertainment System was released exclusively in North America in 1988 .
 The original coin-op version is included in "Capcom Classics Collection" for PlayStation 2 and Xbox and in "Capcom Classics Collection Remixed" for PlayStation Portable".
Assassin's Creed III: Liberation is a 2012 action-adventure video game developed and published by Ubisoft, initially as an exclusive title for PlayStation Vita.
 Sony announced the game at its press conference during the Electronic Entertainment Expo 2012, few days after first leaks about the game presented in "Game Informer".
 It was released on October 30, 2012 alongside "Assassin's Creed III", with which it can be linked.
 The game was re-released as Assassin's Creed: Liberation HD for the PlayStation 3, Xbox 360 and Microsoft Windows via the PlayStation Network, Xbox Live Arcade and Steam, respectively.
 It was later packed as part of "Assassin's Creed The Americas Collection" for the PlayStation 3 and Xbox 360, along with "Assassin's Creed III" and "".

Question: Which game released exclusively on PlayStation portable was released at the same time as Assassin's Creed II in 2009?
Answer: Assassin's Creed: Bloodlines