A Link Between Worlds. Sm4sh is a close second.
I dont think any PS4 games will change my mind, same with BotW. A Hat in Time, Yooka-Laylee, and Pokemon Sun and Moon could get up there, but I'm holding my excitement until I play them.
There's also Persona 5, but I'm getting it on PS3
Edit: I'll give a special mention to Splatoon, which, with all of its flaws, was still a fantastic game. The style and music is something I've wanted for a long time.
Bet with bluedawgs: I say Switch will outsell PS4 in 2018, he says PS4 will outsell Switch. He's now permabanned, but the bet will remain in my sig.
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