the standard melee weapon for close combat, with its own button, as all other weapons assume the role of secondary weaponry and can only be equipped one at a time, though all weapons can be carried in the player's inventory. Bolts can be found in crates, along with ammo, or dropped from defeated enemies. The player also needs to buy ammo for most weapons, but a small number can function without the need for ammo. Vendors, which sell weapons and ammo, are situated at strategic points throughout levels. After completing the game, the player may choose to enter "challenge mode", in which the game's difficulty level rises considerably, but all bolts and weapons acquired the first time are carried through. There is also the option to buy "gold weapons", more powerful versions of existing weapons. The game's health system, Nanotech, starts at four health bubbles equivalent to be able to take four hits, but upgrades can be purchased, giving the player a total of five hit points with the first upgrade and eight hit points with the second. Normally, Clank rides on Ratchet's back, acting as a jet-pack or similar device. Occasionally, however, Clank becomes a playable character when Ratchet is unable to explore certain areas. Clank can control "Gadgebots", smaller robots similar to Clank, who perform certain actions for him. Racing, in the form of hoverboard races, appears in the game. Some racing missions are necessary to progress in the game, while others are optional. One level of space combat and a level of flying through the air shooting tankers is also present. Mini-games that unlock doors, extend bridges, or elevate platforms appear in most levels. Plot In a warbot factory on planet Quartu, a defective but intelligent robot escapes and crash-lands on Veldin, the homeworld of the mechanic Ratchet (Mikey Kelley) (a feline-like humanoid known as a Lombax). After awaking, the robot, nicknamed "Clank" (David Kaye), reveals to Ratchet that he is on a mission to stop Chairman Drek (Kevin Michael Richardson), a corrupt Blargian business tycoon who harvests inhabited planets to create a new one for his race, the Blarg, due to theirs having been overpopulated and severely polluted. However, by doing so, the selected planets are destroyed in the process. Clank offered to start Ratchet's ship using a robotic ignition system, and in exchange, Ratchet agreed to take him to the planet presented in the infobot