Infiltrator

The Infiltrator was a Megacorp gadget used to hack into locks and vaults. It used a sphere with nodes at appropriate intervals. Ratchet needed to connect a line from the starting node back to itself. There would only ever be one solution.

Trivia
According to the Gadget info in Going Commando, the Infiltrator was a stolen design from Gadgetron.

The Infiltrator, along with an Electrolyzer and Hacker, all could be equipped in your hand through a glitch, even though they all were items and therefore unequippable. This suggested that it was going to be a gadget at one point, just like the Trespasser.

Appearances
Ratchet & Clank: Going Commando