Ever heard of a Skinner box? You must have at some point; it’s one of those behavioural experiments where an animal is taught to perform a certain action – usually very basic, like pressing a switch — in return for a simple reward such as food. I’ve drawn unflattering comparisons between Skinner boxes and the mechanics of several of the games I’ve reviewed this year, and nowhere is it more apt than in the case of Tribes Ascend. Nowhere is it more regrettable, either, because staggering beneath the weight of the enormous piles of equipment unlocks and the experience point grinds required to obtain them is an extremely competent multiplayer shooter that’s struggling to escape the shadow of its free-to-play genetics.