Color Block Jam Chained Blocks: Keys, Order, and Safe Unlocks

What unlocks a chained block?

The official glossary says chained blocks are locked until the required number of key blocks are removed. Treat the chain as a dependency node: its route is not the first move; the keys and their matching doors are.

How should you plan the order?

Trace each key to its exit, then note which other block must move before that key can reach the door. Preserve the shared lane until all required keys have been processed. If a clear removes the only stopper, replay before you commit.

What if your source shows a different chain?

Compare the number of keys, chain position, and first unlock with the video. The Level 275 page shows how a guide can separate board evidence from general difficulty evidence; the same separation is useful for chain levels.