Underwater quests, however, have been completely removed, therefore maps such as the Deserted Island and Flooded Forest have been revised to work around this. All the hunting fields in Monster Hunter Tri, along with the addition of the Mountain Stream field are included in Monster Hunter Portable 3rd. A new field introduced in the game is Mountain Stream (渓流, Keiryū?). The player will be able to customize the Felynes in three areas: weapon, head parts and torso parts. Doing so will change the creature's physical appearance and properties. Also new to Monster Hunter Portable 3rd is the ability to customize the Felyne companions' equipment.

When you take Felynes out on quests, monster attacks are divided between the player and the companions, making hunts easier. The player can take two Felynes out with him/her on a single player quest, up from the single companion of Monster Hunter Freedom Unite. Now the Felynes train in the farm and have more training options like the marathon training in which the Felyne runs around the farm. This village has a feudal Japanese feel to it, both from its design to its residents. The new base of operations is Yukumo Village. The game was released in Japan on Augand features enhanced HD graphics, 3D support and shared save support with the PSP. is a high definition remastering of the game for the PlayStation 3, and is the first of Sony's 'PSP Remasters' series for the PS3. However, it is also a successor to Monster Hunter Freedom Unite as the third game in the Portable series. Monster Hunter Portable 3rd is instead separate to the rest of the series, and most of the game has been entirely remade.

Monster Hunter Portable 3rd is not an update to Monster Hunter Freedom Unite or Monster Hunter Tri. The game introduces new regions, monsters, and a revised Felyne combat system. The game was released, as a part of the PlayStation Portable Remaster series, on PlayStation 3. 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.

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