NES Games are in-game games that appear in Animal Forest, Animal Forest+, Animal Crossing, and Animal Forest e+. They are games that appeared on the Nintendo Entertainment System and can be played just as if they were the original. Some can be won at Tom Nook's lottery, while others are obtained as promotional items from a special memory card found in certain Animal Crossing games. Nintendo e-Reader cards also have a few NES games available for Animal Crossing.
According to the e-Reader cards for Mario Bros. and Ice Climber, Tom Nook gave these away for free as a "loyalty gift" for customers of his various stores.
NES Console
There is a NES console that has no games included with it. When attempting to play it, a message is displayed saying you do not have any software to play.
It was recently discovered that the console actually attempts to load NES ROM save files from the Memory Card. These games could then be selected from a list to play. It is speculated that Nintendo planned on distributing these games through some media as additional content.
Some people will do anything to get you into their tents, or stores. Well I can tell you I will not stoop so low. I did however find this classic NES game on a storeroom shelf. Would you like it? Let's just call it a "loyalty gift" shall we?
Ho ho... I just made a deal on a one-of-a-kind classic NES game. Although I don't think that giving stuff away for free is a good business practice, I do hope it will buy your loyalty.
Famicoms in the Japanese version (from left to right: Clu-Clu Land; Balloon Fight; Donkey Kong; Donkey Kong Jr. Math; Pinball; Tennis; Golf; Famicom Disk System).
Trivia
All of the obtainable Famicom games in Animal Forest for Nintendo 64 are Clu-Clu Land, Balloon Fight, Donkey Kong, Donkey Kong Jr., Pinball, Tennis, and Golf.
In addition, the various Famicom games (Save for the Famicom Disk System) are given a color code as well:
Orange: Clu-Clu Land
Grey: Balloon Fight
Red: Donkey Kong
Blue: Donkey Kong Jr.
Yellow: Pinball
Purple: Tennis
Light Blue: Golf
The original Japanese release of Animal Forest+ for GameCube lacks Soccer and Excitebike, and instead features the early Famicom versions of Gomoku Narabe and Mahjong.
Depending on the version of the game, some NES games are obtained through different means.
Clu Clu Land D, Soccer, Donkey Kong 3, Donkey Kong Jr. and Punch-Out!! were initially unavailable in-game, however Nintendo of America and Nintendo of Europe later released codes that could be used in the game to unlock them, though Punch-Out!! was deciphered by fans.
Super Mario Bros. and The Legend of Zelda cannot be played through normal means, although Super Mario Bros. was given away between 2001 and 2002 by Famitsu for Animal Forest+.
Some NES games were re-released in Classic NES Series for GBA.
When playing Animal Crossing using a setup that supports the game's progressive scan display mode, the mode must be activated in order for NES games to be playable.
In New Leaf, the New Nintendo 3DS and Wii U furniture items received from fortune cookies may be a nod to these NES games, as they are playable Nintendo consoles.