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- Magical Tree (Homebrew port)
- Mario Bros (Homebrew port)
- M*A*S*H (Unreleased prototype)
- Maze Maniac (Homebrew)
- Memory Manor
- Meteoric Shower
- Miner 2049er
- Monkey Academy
- Monster Bash (Homebrew Port)
- Monster Masher (Homebrew)
- Montezuma's Revenge
- Moon/Matt Patrol (Unreleased prototype)
- Moonsweeper
- Motocross Racer
- Motocross Racer/Tomarc the Barbarian ("Double-Ender")
- Mountain King
- Mouse Trap
- Mowleco (Homebrew)
- Mr. Chin (Homebrew port)
- Mr. Do!
- Mr. Do!'s Castle
- Ms. Space Fury (Homebrew)
- Music Box demo (Unreleased prototype)
Read more about this topic: List Of ColecoVision Games