In contrast to Mark, the difficulty I had with this was keeping games that weren't released in 2015 off the list. I did a lot of exploring in 2015, and participating in a fortnightly game challenge also meant I was working through my back catalogue more than I ordinarily would have been.
But that's not to say that there weren't plenty of new releases worth paying attention to. If anything, 2015 has probably been the best year for releases since the launch of the new consoles. So without further delay, here's my unordered selection of what I thoroughly enjoyed from the last 12 months.