Are the gray rails a color group from the start?

No. In the opening they primarily frame and cover the colored route. Follow the active target row and clear gray when its target phase appears.

Why does the cyan slab remain visible?

It is part of the translucent inner structure. A visible slab is not automatically the next tap; use the current target and exposure state.

Cube Tap Sort level guide

hard 12 colors

Open Level 24's colorful route inside the gray frame from yellow and blue, then finish the final gray and ice structure.

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From the exposed inner windows, clear yellow 2 and blue 1; leave the gray perimeter untouched.
After the frame re-presents automatically, follow the green/purple and pink/orange windows named by the row.
In the inner window path, take cyan and the remaining colored windows only after the next opening appears; the gray perimeter still blocks the rear faces.
Keep the gray rails and translucent cyan slab out of the buffer plan until their target boxes are active; visibility alone does not make them removable.
When gray/ice becomes the final row, clear the frame rails around the lower window, then wait for WELL DONE.

Colors in this level:

Yellow, Blue, Green, Purple, Pink, Orange, Cyan, Gray, Lavender, Red, Peach, Lime

Take yellow 2 and blue 1 from the exposed inner windows, not the gray perimeter.
Let the frame re-present automatically, then use the target row to choose the next green/purple or pink/orange window.
Re-check the frame opening after each shift; the cyan slab is depth structure until its phase is active.

Board notes 5 details

Layout: The opening board is a large gray rectangular frame around colored windows and a translucent cyan slab. Yellow 2 and blue 1 are active, and the buffer row is empty.
Goal: Follow the inner route through green, purple, pink, orange, and cyan before clearing the final gray/ice frame.
Opening: Clear the exposed yellow 2 and blue 1 faces inside the frame.
Danger Zone: Gray rails are structural cover until their target phase appears; colored windows can change exposure as the frame re-presents.
Mechanics: A framed cube reveals a colored inner path through automatic re-presentation while its gray perimeter remains access-limiting cover; no manual swipe is introduced in the source.

Are the gray rails a color group from the start?
No. In the opening they primarily frame and cover the colored route. Follow the active target row and clear gray when its target phase appears.
Why does the cyan slab remain visible?
It is part of the translucent inner structure. A visible slab is not automatically the next tap; use the current target and exposure state.