Heres a few that I took off a list of NES games
http://en.wikipedia.org/wiki/List_of_Nintendo_Entertainment_System_games and here is my take on them. Keep in mind there were a lot more games that are said to be made by Nintendo which really aren't. Faxanadu for example was really made by Hudson Soft, hence is not included in this list even though it is listed as First Party. These are games only made by Nintendo (as far as I know):
10-Yard Fight, NES Baseball, Golf, NES Open Tournament Golf, NES Play Action Football, Ice Hockey, Soccer, Nintendo World Cup, Super Spike V Ball, World Cup Soccer- Again these games I've seen but never played. You know I never really liked sports games. I can recall memories of watching my cousin play Ice Hockey and being horrifyingly bored until the Zamboni came out for a laugh. The music alone was silly enough to crack a smile. Most of these probably aren't serious enough to consider being "real" sports games per say but some of them were some of the first 8 bit ones.
Anticipation - Yes, Pictionary without being Pictionary. I loved this game. Would play this at my cousin's house. If there could be music in a 1950's Ice Cream Parlor we know how it would sound. The game was fun, especially when you had more than 2 people playing. Since my cousin's family had a lot of money at the time, he had over 50 NES games and almost all the accessories. This happened to be one of the games that was most enjoyable because everyone could join in.
Balloon Fight- Seen it, never played it, reminds me of a game called Joust that used to be on my old Atari Computer. Wasn't there a sequel to this called Balloon Kid?
Clu Clu Land - Very weird looking puzzle game. What the heck is a Clu Clu anyways? Funny how people use similar names when creating newer puzzle games also. Chu Chu Rocket kinda sounds similar to this name doesn't it?
Dance Aerobics, Super Team Games/Family Fun Fitness- Ah Fitness and Aerobics games for the Power Pad. This was Wii Fit before it was Wii Fit. The game may be forgotten, but the concept sure wasn't. Fitness and Dancing sure don't seem to go out of style. And no I have never even touched these ones.
Devil World - Don't even ask me about this one. Since it was only released in Japan I never even heard of it until looking on the NES list and finding it.
Gumshoe - Another one I hadn't touched. Heard of it, never really seen it in detail, never bothered.
Gyromite - Always heard about this one, Always seen the commercials for ROB the Robot and this was always packaged with it. Even my cousin never had this. From what I can see, this seems like it was complex. You couldn't get through a gate without ROB unlocking it. And heaven help you if you had a broken ROB. I guess this is why my parents and my cousin's parents never bought this.
Hogan's Alley - This one I had the pleasure of playing in Arcades actually. Never had the home version but it was pretty much the same thing. This was fun. Only thing even more fun then this I'll discuss later on. This zapper had so many things you could do with it. It was kept simple while the Super Scope utilised all buttons of the SNES. That reminds me, if anyone gets a chance to check out Battle Clash and Metal Combat, I unfortunately never got to play them on SNES hardware but I did get to play them emulated. These games are also forgotten 1st party Nintendo games. Fun as hell though.
Mach Rider - You got me on this one. Upon reading about it, its a futuristic driving game. Ridge Racer before it was Ridge Racer perhaps?
Pro Wrestling - Owned it and LOVED it. There was no greater feeling than King Slender backbreakering people like crazy to win the game. Then you could do it all over again with Starman with the somersault kick.

The lil one, two, three count was a quirky voice sample. The music was rather silly as well in the ring but fast paced. There is no greater feeling then after defending your title and then kicking the crap out of great puma. They figured he would be hard to beat because he could do all the moves. But he was no match for a somersault or backbreaker spam attack from Slender or Starman.
R.C Pro Am - Played this one. Never its sequel. Loved it though. It would be cool when you'd get the upgrades and the car would change. It was a nice feeling that as you went on, your car would go from ugly as hell to sleek. Watch out for oil slicks. That Title Screen music is awesome. I have it stuck in my head. Gaaaah.
Short Order/Eggsplode - Wha? No again never heard of it. Never played it. Maybe someone else can fill me in.
Snake, Rattle and Roll - Heard of it. Never played it. It is apparently a game about two snakes who have to eat pellets to win. A platformer. *shrugs* I'm just reading the description here. But I have heard the title.
Stack-Up - Another one I'm lost on....
Startropics and Startropics 2 - You know I've never played this games, yet I always heard how good they were. Seems to me that basically after the 2nd one Nintendo kind of just forgot about the series, although if you look hard enough, there are die hard fans of the game out there.
To the Earth - Again lost upon me. Perhaps someone else can take this one also and fill me in.
Urban Champion - Looks to me like a piss poor Punch Out. Though I could be wrong. There are I'm sure some people out there who would bite my head off for saying that because I haven't tried it. I have realised though that looks aren't everything. So hey I dunno it could be good for all I know.
Wild Gunman - YES! Fun to play, Funny to see the Outlaws get shot, Nice lil funny tune once you shoot people, Doo Doo Doo Doo Da Doooooo, Loved playing this. Never owned it, but would hog my cousin's NES just shooting outlaws all day. When you get more than one that's when it gets crazy. But still fun times with this one. Was well worth it.
World Class Track Meet - This one would always make the chandeliers shake at my Aunt's house. A bunch of fat kids we all were pounding our feet down on the mats just to see how we could do. Finally, you realise you could just use your hands to cheat, when you got winded. Fun! Least you get to rest while watching the sprite limber up.
Wrecking Crew - Mario, if he had stayed a carpenter. I played this. It just seems like there's a lot of games out there similar to this. A puzzle game where you have to find creative ways using blocks and other things on the stage to beat the enemies. Mr Do's Castle is kind of along the lines of this.