You cannot start it right after you reach its starting point on Cortex Island.
you could reach the starting point of this stage along he path shown in the above screenshot.
By default, you cannot use it, because the level is hidden.
You receive the key after you unlock and complete the Neo Cortex’s bonus round.
After you start the stage, explore the bottom part of the screen.
it’s possible for you to land there on the safe ledges placed on the sides.
There are several crates that you might find in this part of the corridor.
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