"ratchet & clank: up your arsenal" was the main focus of the insomniac team during development. the team of around 115 people were aiming to create a new "ratchet and clank" game that would differ significantly from its predecessors and almost end up being two games in one. insomniac believed that one of the key processes in the development process was the rigorous testing. working closely with sony and listening to fans of the "ratchet and clank" series, they gathered feedback and made improvements to the game. they felt that they had created a game that would appeal to a number of genres with the inclusion of elements of platform, action and side-scrolling gameplay.