How to Identify the Main Blocker in Hard Color Block Jam Levels

What makes a blocker the main blocker?

A blocker is the main blocker when moving it or changing its state opens more than one route. Size, color, and screen position are not the test. A small key, a chain, a rope, or a door that changes color can control several destinations, while a large block may control only one.

Count the routes that become reachable if the object moves, then compare that number with the alternatives the board still offers. Rollic’s official Obstacles in Color Block Jam article explains that obstacles such as arrows, ice, chains, ropes, and changing doors each have their own unlock condition. That matters here, because the unlock condition decides whether the controlling object can move at all.

Identify the object type before you rank it. A blocker whose unlock condition you have not met cannot be the next move, even if it controls the most routes.

This step is narrower than general obstacle ranking. Ranking orders several obstacles against each other, while identifying the main blocker answers a single question: which object, if it stays where it is, keeps the most routes closed?

How do you trace which routes depend on one object?

Trace backward from each destination rather than forward from the most tempting move. The object that appears in the most traces is your main blocker.

1. List every visible destination, exit, or gate on the board.
2. For each one, name the block, key, or obstacle that currently prevents access.
3. Group the destinations that share the same controlling object.
4. Note which of those groups already has a working alternative route.
5. Rank the objects by how many destinations lose access when they stay in place.

This is a planning model, not a claim that every board uses the same mechanism. It gives you a short list of candidates instead of a single guess, which is what Rollic’s advice to study the entire board and plan a few moves ahead is really asking for.

The same dependency logic applies when you plan the whole sequence. Our exit-order method uses the same trace to decide which route can be completed next, and the obstacle priority ranking helps when several objects affect one route.

How do you confirm the prerequisites before you move it?

Confirm that the prerequisite is already satisfied, or that the move you are about to make will satisfy it. A blocker that controls three routes is still not the next move if it needs a key you have not collected.

Check	Useful answer	Warning sign
Unlock condition	A visible key, clear, or state change	“It should open”
Alternative routes	Each destination still has one	One destination has none
Space released	Enough for the next block	No landing space
Reversibility	Undo or restart still available	The move is final
Next checkpoint	A visible state change	No way to verify

If you cannot fill in the first two rows, keep scanning. A blocked main blocker usually means you are solving the layers in the wrong order, not that the level is unsolvable.

What should you do after the main blocker changes state?

Rebuild the dependency list from the new state instead of continuing an old plan. One clear can change which object is now the main blocker, so the ranking you made before the move is only valid until the board changes.

Rollic’s hard-level tips emphasize patience and order, and its obstacle article shows that different objects respond to different actions. Treat every state change as a checkpoint: re-list the destinations, name the new controlling object, and only then choose the next move.

If a route that should be open is still blocked, the board state does not match your plan. Stop adding moves and compare what you predicted with what you can see.

When should you stop and recheck the board?

Stop when the main blocker you identified cannot move, when two destinations need the same single lane, or when the next move would depend on a guess. Return to the last state that matched your notes rather than repairing an unknown board.

If the blocker’s position or the opening board does not match the source you are following, the route is only a lead. Use the board-match check before trusting the rest of a walkthrough, and keep the observed difference separate from any explanation about versions, devices, or tests.

A sequence demonstrates only what happened on the board it shows. It does not prove a hidden mechanism, a guaranteed move count, or the reason your level looks different. Record what you can see, then decide.