Nintendo 64 Rumble Pak
Not a game, you insert it into the controller and it allows the rumble/vibration feature in certain games. Similar to the rumble built into controllers like the GameCube etc.
The ones I got were official Nintendo.
No this is the rumble pack that goes in the bottom of the N64 controller to make it vibrate.
No! The Nintendo Branded one only had rumble feature but there were some 3rd party rumble paks made back in the day that did have memory built in bit Nintendo brand never released a rumble pak with built in memory!!