So, let's just say everyone has as much money as they want and could buy any system.

What game exclusives make you want each system, or what made you buy one?

Wii U - It was mainly the announcment of SMT x FE that made me want a Wii U. I got it 2013 because I wanted Monster Hunter 3 Ultimate. Also seeing Xenoblade, it really made me want one.

3DS - Fire Emblem Awakening. What more can be said?

PS4 - The main reason I want a PS4 (and I know it's not entirely exclusive) is Persona 5. I don't have a PS3, so why buy it (don't tell me why I should lol) when we are in the new gen. The Last Guardian and Horizon Zero Dawn have also made me really want a PS4. (As well as several Multi plats.. but they aren't exclusive so they don't count as much)

Xbox One - The only game I REALLY REALLY REALLY want on this system is Scalebound. Which sucks because I want Scalebound more than TLG and HZD....

PSVita - I haven't looked at a whole lot of exclusives (I do want Freedom Wars), but I do know there are a shit ton of exclusive JRPG's on it, and it may make me purchase one at a later date. 

PS4 - Infamous Second Son

Vita - Destiny (remote play)

3DS - Zelda LBW

XB1 - I was waiting for Quantum Break, but the TV deal at Best Buy was too good for me to pass up

Wii U - Super Mario 3D World

Tomb Raider Definitive for PS4

Titanfall for Xbox One

Nintendo name brand for Wii U

PlayStation name brand for Vita

Ocarina of Time 3D for 3DS

I bought my 3DS for Pokemon, like the rest of my handhelds. Though I have to admit Fire Emblem Awakening still is the best 3DS game I have played.

True. 

I always get consoles for Pokemon as well, but we didn't hear of a new Pokemon until after Awakening. So yeah. :D

No one game made me buy a PS4 I don't see the sense in spending $460 to play a game. Buuttt just all the games that were coming out holiday 2014 and early 2015 made me pick one up in July. (And it being my birthday)

And now I don't have to worry about buying a console anymore and can just buy all the crazy games coming out this holiday and all of 2016.

Wii U...Zombi U, NSMBU,
3DS.....No game in particular, just the stereoscopic 3D gimmick which is cool.
PS4.....Batman AK

Wii U: Pikmin 3
PS4: infamous and killzone
Xbox 1: I haven't bought one. Microsoft would have to give me one for free. Nothing would make me want to buy it.
3ds: resident evil revelation

Well, i didnt really buy for one game, i bought most because of the promise of games that i knew would come to them.So for example, JRPGS in PS4 and quality games that i knew Nintendo would deliver(I own a 3DS,WII U, PS4 and a Vita)

Well, the title is "What games" referring to multiple. 

Most people always need multiple games on a system to get one. I'm just asking for the one game, or two (or three, etc) that was the final decision in the purchase. Like for me, I would have gotten a 3DS for Pokemon, but since I knew it was coming eventually, I decided to get a 3DS early due to Fire Emblem. It was really the pushing point for me.