Resistance: Retribution

The game offers 8-player online multiplayer matches with modes that include Team Deathmatch, Capture the Flag, Containment, Free for All and Assimilation.

The aiming system is designed differently, instead of pressing buttons to lock against cover, it will automatically lock the player to cover when he or she goes near cover. Aim assist, as observed in Resistance: Fall of Man, is also present in Retribution. Retribution features new characters and weapons, as well as a non-replenishing life bar.

Two months before the Chimera's central tower in London is destroyed and their armies are defeated in Britain, British Royal Marine Lieutenant James Grayson finds his brother Johnny partially converted into a Chimera while on a mission to destroy one of the Chimeran conversion centres. Grayson reluctantly follows protocol regarding infected soldiers, and kills Johnny, but this causes him to suffer a nervous breakdown and he deserts his troops, leading his own personal vendetta against the Chimera. After destroying 26 conversion centres, Grayson is captured by the British and put to trial for capital crimes, where he is sentenced to death for desertion. The night before his execution, Grayson is visited by Lieutenant Raine Bouchard, a member of the European mainland resistance movement known as the "Maquis", who offers Grayson a reprieve in exchange for his aid and knowledge on conversion centres.

Grayson is initially reluctant, but is more interested when he learns that Bouchard and her father are developing a serum to counteract the Chimera virus. Grayson agrees to the deal, though he demands his brother's jacket as an extra condition, and is released as a mercenary contracted to the Maquis.

Resistance: Retribution received generally favorable reviews, according to the review aggregation website Metacritic. GameTrailers praised the presentation and gameplay and also awarded the game their Best PSP Game of 2009 title. GamePro reviewer Heather Bartron praised the game's cover mechanics for evading enemy fire and the game's well-placed checkpoints and level designs. Bartron wrote the game would appeal to both casual and experienced gamers, although she disliked the repetitiveness near the end and that most of the game's elements were left unchanged from the previous titles. In Japan, Famitsu gave it a score of all four eights for a total of 32 out of 40.