Micro Machines

To activate the CHR RAM "Smiley Test" easter egg for this game, you will need to power on the NES/Famicom console while holding Up, Down, Left, Right, B, Select, and Start. Note, however, that it is not normally possible to hold all four D-Pad buttons without specially modified controllers; standard NES/Famicom controllers will not work.

Complete the Qualify race, regardless of your success. Before ending the race, hold Up, B, and Select, then continue holding these buttons. When the screen changes color, press Start to view a secret credits screen. After this, press Start to continue the game: regardless of your previous success, you'll be qualified to challenge with 6 extra lives.

In the single-player mode (Challenge), win three races in a row to enter a bonus stage (Qualifying Race not included). Complete the bonus track within the time allotted and a Rufftrux monster truck will be added to your collection of vehicles.