This is part 5 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 half of part 5 begins with two 3x3 tile platforms on the same side. Following them is a "U" shaped platform on the right side over, which bridges them to two additional 3x3 platforms. The second half is the same pattern, except mirrored and in darkness. It may not be advisable to take power cells, as they can cause you to spiral off track, forgetting where you were in the dark tiles.