The extra buttons were helpful, but never overbearing. In each game, we found the Proteus Core to be responsive, accurate and precise. We tried it with 'BioShock Infinite,' 'StarCraft II,' 'Batman: Arkham City' and 'World of Warcraft,' and found it equally suited to first-person shooter (FPS), real-time strategy, action/adventure and massively multiplayer online (MMO) games. Thanks to the Proteus Core's large, sensibly spaced buttons, the mouse does a good job of controlling games from just about any genre. This provides very granular control over the feel of the mouse, as adding weight to the center of the mouse can feel very different from adding it to the back. Gamers select not only how much weight to add, but where to add it. Rather than an ejectable canister as on the G500s, the Proteus Core has a magnetic door on its underside, hiding spots for five 3.6-gram weights. The G500s had adjustable weights, but the Proteus Core refines this feature. (We tried both, as well as a standard office desk, with impressive results.) By testing the surface you use for the Proteus Core, users can optimize anything from a high-end mouse pad to a sheet of paper. The Proteus Core boasts two other innovative features: a surface-testing capability and an adjustable weight system. One of the best features of the Logitech software is its ability to scan your PC, determine which games you have installed and automatically create profiles for them. The Proteus Core can store three profiles internally, or a virtually unlimited number of profiles on a computer. While this software lagged behind the comparable Razer Synapse software a few months ago, it has really come into its own in the interim. The Proteus Core runs on the same Logitech Gaming Software as all other modern Logitech mice. Otherwise, it's hard to see how Logitech could have devised a better all-purpose gaming mouse design. Palm players with large hands may find the Proteus Core a bit small for their tastes. The DPI buttons, located next to the left mouse button, are both remote enough to stay out of the way and large enough to press easily without looking. The thumb buttons are large and distinctive, and the lowest one is ideally situated for a 'sniper' button that lowers DPI - a useful feature in first-person shooters.

Otherwise, Logitech arranged the buttons on the Proteus Core in a very smart layout.

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