If you are interested in the top five most played PC games, according to Raptr, then the rank order has not changed much. Each of them bled a lot of mind share though. In January, the top twenty games accounted for 61.93% (give or take rounding error) of total time, with 44.05% of total time dominated by the top five. In December (2014), the top twenty games had 78.41% of total play time, or 57% for just the top five. This means that PC gamers, at least those using Raptr, were spending a lot more time playing a diverse spread of less-popular games last month.
The biggest change (by rank) was Warframe, which lost six ranks and 43.2% of its play time, even though that was only 0.6% of Raptr's total. The second-largest change in the bottom fifteen games is Diablo III, which climbed up five ranks due to a major update that was released halfway through the month. The third-largest change is Dragon Age: Inquisition, which lost almost half (43.3%) of its play time, resulting in a drop of three ranks.
Even though the ranking had a few big movements internally, all twenty were also on last month's list.