This is part 6 of the Memory Evaluation tunnel.
Note: Since you can only use the Gentleman in this tunnel, he will be the only recommended character.
The first pattern of this level has platforms alternating between two different sides. Jumping back and forth between them will lead to a tile ring, marking the beginning of the second pattern.
The second pattern has a long vertical platform followed by a long horizontal platform and two short platforms. Another tile ring will appear dividing the light section and the dark section. To make the jump between the two sections, you'll have to be quick about getting to the opposite side of the ring.