Killdoors are objects in Rayman Junior and Rayman Designer which trigger the disappearance of certain events, usually ones blocking Rayman's path. There are two types of killdoors available; normal killdoors and Ting killdoors.
In Rayman Designer and its spin-offs
Normal killdoors are not visible by the player and trigger the disappearance of one or multiple events when Rayman comes within its range. They are usually set to trigger the disappearance events blocking Rayman's path.
In Rayman Designer, there are several types of normal killdoors available. There are the super killdoors, killdoors size 1, killdoors size 2, killdoors size 3 and killdoors size 4. The super killdoors saves its action upon the player dying, while the others reset. The size determines the range of the killdoors. Size 2 has a 50% larger range than size 1, size 3 has a 100% larger range than size 1 and size 4 has the same range as a Ting.
Ting killdoors are activated once all Tings of a specified colour, except for the normal blue, have been collected.