Cartoon Line: Part One is a side view fixed screen action game set in the old West. The back story involves a character called Snow Face who attempts to kill everyone in town, including the player. The game contains four levels each involves a number of trials where Snow Face is trying to murder the player in various ways. For each trial there is only one action that can save the player's life and it has to perfectly timed. In each playthrough the trials happen in a random order. The player can walk left and right across the screen and use three actions: jumping, squatting and starting a predefined action. When starting out the player has four lives and additional ones are given for each new level or when reaching 10,000 points.