Tron Maze-a-Tron has you playing as Flynn, who's been zapped into the circuits of the Master Control Program (MCP). The MCP has plans for world domination, and only Flynn can stop it. Your ultimate goal is to disable the MCP.
The game is played in rounds, first facing Circuit Maze and then the Master Control Program. In the maze phase, you collect energy for your shields, which can be used to protect Flynn from some enemies. You also collect zeroes that are used to clear RAM.
When you proceed to the Master Control Program, the MCP works to fix the RAM you cleared. Your goal here is to fire a Bit-Gun at pairs of BIT streams and BIT stacks before they hit the top of the screen. These two phases repeat with a higher difficulty each time.