How to Identify the Main Blocker in Color Block Jam

What makes a blocker “main”?

It is not simply the largest block or the one closest to a door. It is the object that controls several future routes. A chained door, central block, barrier, or state-changing gate can all be the main dependency depending on the board.

Three questions to ask

1. Which routes become possible if this object moves?
2. What must happen before it can move?
3. Does the move create space, or only relocate the problem?

When should you stop?

If the source’s main blocker is not in the same position as yours, do not adapt the rest of the video by guesswork. Compare the board and report the mismatch through this checklist.