Big Nose Freaks Out is a platform game for the NES, produced by Codemasters and published by Camerica. The player controls a cave man character who has had all his bones stolen from a prehistoric bank by a dinosaur. Bignose sets off on an adventure through numerous prehistoric settings. Bignose defeats enemies using a club, however he also has access to a primitive skate board device (stone-boarding), via his invention - the wheel. The game is essentially a platform game in which the player collects bones and other items, while travelling from left to right until reaching the goal. B.N.F.O also had a two player mode and the addition of numerous secret levels and bonuses. Big Nose Freaks Out has become popular as more people have access to the ROM file through emulation websites.

On a Tuesday afternoon sometime in 17 million BC, Big Nose the caveman was on his way to the Savings and Bones to deposit a large amount of savings. But before he got there, Leroy the Lizardman knocked out Big Nose and stole his savings. When Big Nose woke up and realized his savings were gone, he freaked out! Now he created a wheel with a platform on it and is out to get Leroy. Big Nose Freaks Out is a side scrolling platform action game. There are five sections of gameplay each with four levels to clear. At the end of each section Leroy will be waiting with a large monster. To fight back Big Nose has his trusty club with him. Also, rocks can be found along the way and the club used to bat them at enemies. There are many hidden treasures, hidden levels, and even some level warps to search for.