A pseudonym for John Cooney, a flash developer for Armor Games, who makes many small games such as Achievement Unlocked, This is the Only Level, and Exit Path. These games tend to be very meta and really think outside the box. Jmtb02 is an acronym for John Mountain Bike 2002.
Person 1: Have you played the new jmtb02 game, This is the Only Level 78?
Person 2: No, I'll have to check it out!