Only recall three games in particular for this year, but two of them are awesome handheld experience!
Monster Hunter 4 Ultimate came alongside the new 3DS, and after a couple failed attempts of getting into the MH series previously, it had finally clicked here. It had since became my most played game on the 3DS at 120+ hours. I was particularly fond using the charge blade to take down some of the coolest monsters ever, and even got to special G-rank! Overall I definitely had a lot of fun to this, with the gameplay feeling quite rewarding once you get the hang of it.
Lara Croft GO was revealed and came out this year also, and it basically became one of my favorite mobile games. Just a really stellar presentation all around, and I feel like in a time where the reboot came out, GO carried the spirit of Tomb Raider better. It felt like a strong Tomb Raider game in bit of a different way, and has a really nice sense of isolation similar to what the original TR had. It was also my intro to the GO series, which sadly has ended now. :(
Guild Wars 2: Heart of Thorns was the first expansion to Guild Wars 2, which admittedly had some mixed results, but I did like the vertically of the new maps, the Revenant class overall & the new elite specs, and especially the new raids. I joined a couple groups, and man was it so fun trying to beat the raid bosses, some of which were really awesome fights. I eventually retired from raiding, but it was great being able to at least get through all of the 4 Heart of Thorns raids, and crafting a legendary armor piece as a result from that.