7
Super Mario 3
Nintendo This game is a total classic for me. Played the crap out of it as a kid and is my most popular game to play on an emulator (on phone or PC). This first two Mario games were fun and at release, great games, but it was the 3rd that really blew me away. The world layout of the map gave you options for which levels you wanted to play, there wre whistles to sneak past other levels, there were more costumes to give you abilities, tons of different enemies, boss battles, secret areas, and just a ton of fun. This was clearly my favorite Mario game from the NES platform.
6
Battlefield 3
PC While I put more hours total into TF2 due to it being around for so long, this game may have the most hours I put into it in a single year (or two). I was not a PC gamer before this game was released and after building my first gaming rig, I picked up my first Battlefield game and was blown away by the massive size of the maps, the amount of vehicles, and the overall action of playing multiplayer. The single player (like COD) is fun and enjoyable to play through once, but that's not the meat of the game. The 64 player matches was were the fun was at. 64 players in a large map made it feel a lot smaller, but the vast amount of interaction in the world was unlike anything I had seen in a FPS. The encouragement of teamwork and planning of attack made for a likely win so getting on a server where you can talk to your squad gave you a huge advantage. I should add that the graphics and the sound were also big reasons for me loving this game, it was beautiful! I also loved the expansion maps, they added so much to the game. I did not play the older BF games, but the newer ones are good, but overall have not come as close to this game in terms of maps and overall gameplay plus the nostalgia factor for me.