The Conveyor is a gimmick in the classic Mega Man series, debuting in Mega Man 2 and appearing in several more games since. While their specific appearance varies by game (and sometimes even by level), they all share the function of moving Mega Man in a certain direction.
The original Make a Good Mega Man Level included two variants of conveyor: The conveyors from the aforementioned Mega Man 2, and the conveyors from the first Wily stage of Mega Man 5 (often known as Wheel Conveyors). Conveyors appeared in the entries The Quickening, Chroma Key, Sunset Siege, Napalm Forest and Caves, and Maze of Death, as well as the Wily stages Be the Bigger Person and Flashback Database. In Make a Good Mega Man Level Remastered, Be the Bigger Person's New Style version includes custom Mega Man 2 conveyors that move faster than the original.
Make a Good Mega Man Level 2 brought back the Mega Man 2 conveyor, and replaced the Mega Man 5 "Wheel Conveyor" with conveyors from Knight Man's stage from Mega Man 6. Conveyors appeared in ten entries, with City Under Siege including conveyors from the revisited Spark Man stage from Mega Man 3, and Cyber Man including custom conveyors. Conveyors also appeared in the Wily stage Reality Core, the Tier X level Mario Land (which used both Mega Man 2 conveyors and custom diagonal conveyors based on Super Mario World), the Pit of Pits stages "A Warehouse of Scissors", "Deja Vu" and "What a rush!", and in Null and Void.
The Megamix Engine includes all three prior devkit conveyors, as well as a new conveyor from Compass Man's stage from Rockman & Forte: Mirai Kara no Chousensha. The four types of conveyors are set to appear as devkit assets for Make a Good Mega Man Level 3 and Make a Good 48 Hour Mega Man Level. Another conveyor from various Mega Man 10 stages (not to be confused with the Sheep Conveyor) was also added to the engine between the end of the MaG48HMML submission period and the beginning of the MaGMML3 submission period.
When Mega Man is standing on a conveyor, it will move him in whatever direction it's facing. Most conveyors are strictly horizontal, but the Super Mario World conveyors from Mario Land are diagonal.