How the Locked Door works
A locked door is bound to a specific color. Sending the key block through the matching color gate unlocks it.
It is one of the core obstacles you meet through the early and mid levels, usually alongside plain colored blocks and simple gates.
How to play around it
Find the key block early and clear its route, because nothing passes until the lock is released.
Like every obstacle in the game, the locked door never makes a level impossible. Every board can be finished without boosters, so if a route feels blocked, the answer is usually the order in which you clear the other colors, not the obstacle itself.
Where you meet it
The Locked Door typically starts appearing around Level 260 and stays part of the rotation from that point on. Boards that feature it become more frequent as the level numbers climb.
See it in action on the Levels 251–275 walkthrough index, or browse every mechanic on the mechanics guide.
Locked Door FAQ
What does the Locked Door do in Color Block Jam?
A locked door is bound to a specific color. Sending the key block through the matching color gate unlocks it.
How do I deal with the Locked Door?
Find the key block early and clear its route, because nothing passes until the lock is released.
Which levels have the Locked Door?
It typically starts appearing around Level 260 and is used more often as levels get harder. Open the level walkthrough index to find a video for the exact board you are playing.