Resogun really is that rare kind of arcade game that feels like an entirely different beast when played on the toughest setting. It's also the closest the PS4 launch line-up gets to offering a genuine next-gen thrill. Granted, Housemarque's not offering the shock of the new, perhaps - all of the developer's best ideas are actually reassuringly elderly - but it's working with energy, enthusiasm, precision and love. Oh, and voxels. Look at them scatter!