Secret Agent Clank

Unlike previous Ratchet & Clank games, Clank's gameplay is more like Ratchet's in comparison. In previous titles, Clank's gameplay consisted mostly of brief, puzzle-platform-oriented segments with minor melee combat elements; in Secret Agent Clank, he has weapons and gadgets of his own. Featured are quick time events where the player must press a sequence of buttons correctly to sneak through an area undetected. Giant Clank, wherein Clank transforms into a monster-sized fighting machine, also makes an appearance.

Besides Clank, both Ratchet and Captain Qwark are playable in the game, as are the Gadgebots. Qwark's gameplay segments are based on dubious accounts of his own exploits and are more action-based. Ratchet's segments in prison are more like the arena gameplay featured in previous games in the series. The Gadgebot segments require switching between Gadgebots to solve puzzles.

A precious gem known as the Eye of Infinity, held at the Boltaire Museum, has been stolen, with Ratchet falsely accused and jailed as he is at the scene of the crime. Skeptical about his involvement, Clank infiltrates the Museum to find out more about the Eye of Infinity. But much to his dismay, Clank finds only coordinates to Asyanica Rooftops. Meanwhile, in jail, Ratchet is forced to fend off the majority of the inmates whom he is responsible for their imprisonment to stay alive.

Clank travels to the Asyanica Rooftops, but is held captive. He contacts the agency Gadgebots to free him.

Secret Agent Clank was in development before the release of Size Matters. In July 2007, rumors of the game's existence surfaced when David Bergeaud, who composes music for the Ratchet & Clank series, accidentally revealed the game in his online resume. The actual game was not confirmed by Sony until a pre-TGS 2007 conference.

On September 17, 2024, the PSP version was re-released for PlayStation 4 and 5. It is an emulated version that allows for enhanced graphics, save states, rewinding, custom controls and trophies.

Secret Agent Clank received "mixed or average" reviews from critics, according to review aggregator website Metacritic.