In an interview, Ed Logg notes that the Tengen version of "Tetris" was built completely from scratch, using no source code or material from the original game. After presenting the title at the Consumer Electronics Show in Las Vegas, Tengen president Randy Broweleit requested improvements in the game. Originally portrayed solely in black and white, Broweleit requested that the pieces be portrayed in color, and Logg altered the game accordingly prior to the next Consumer Electronics Show. When asked which version of "Tetris" he liked the most, Logg stated the Nintendo version of Tetris for the NES "wasn't tuned right", citing a lack of logarithmic speed adjustment as the source of that version's overly steep increases in difficulty.