When you join a world, the mod opens your own Super Meat Boy install, reads the real Forest level layouts (1-1 through 1-20), and builds each one block by block in a side-view course dimension.
Real SMB levels: the walls, start point, saws, bandages and Bandage Girl all come from Super Meat Boy's own level files on your PC.
Meat Boy controls: side-on camera, A/D to run, big jumps, wall-jumps and wall-slides.
Saws kill instantly: you burst into meat and restart the level at once, just like SMB.
Meat trail: every surface you touch gets smeared red.
Bandages and Bandage Girl: grab the bandages, then reach Bandage Girl to clear the level. The next Forest level builds automatically.
A timer, a death counter and a bandage counter on screen.
Commands: /smb play 1-3, /smb next, /smb restart, /smb list.
Needs Minecraft: Java Edition and Super Meat Boy (Steam) installed. Solo.