Why can I see a color that I cannot tap yet?

The translucent layers show covered rear faces. Tap only the matching face that is exposed in the current orientation and target row.

What is the final gray shape?

It is the remaining shell/ring after the colored groups have cleared. Finish that target phase and wait for the completion reward.

Cube Tap Sort level guide

hard 12 colors

Open Level 21's translucent layered cube with the green and gray targets, then follow the refreshed route to the final gray ring.

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From the exposed outer layer, clear green 5 and gray/lavender 3 in the opening target row.
After the shell re-presents automatically, follow the red/pink and orange/cyan groups on the new outer side.
On the outer face opposite the translucent center, take blue, then green and yellow only when their boxes are active; a matching rear face remains behind the shell.
After each automatic side change, confirm the target count and keep the center untouched; the next legal face must sit outside the translucent layer.
When gray/ice becomes the active row, clear the ring around the lower outer rim, then wait for WELL DONE.

Colors in this level:

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

Take green 5 and gray/lavender 3 from the exposed outer layer, not a rear face seen through the shell.
Let the shell re-present automatically, then read the red/pink and orange/cyan boxes before choosing a side.
Keep the translucent center as a depth warning; a matching rear face is not automatically exposed.

Board notes 5 details

Layout: The opening board is a large translucent blue-gray cube with colored faces around its outer layers. Green 5 and gray/lavender 3 are active, and the buffer row is empty.
Goal: Advance through the refreshed red, pink, orange, cyan, blue, green, and yellow targets before clearing the final gray/ice remnant.
Opening: Clear the exposed green 5 and gray/lavender 3 groups first, then wait for the shell to re-present.
Danger Zone: Translucent layers reveal colors that may still be covered; use the target row and the current orientation together.
Mechanics: A large layered cube contracts and re-presents automatically through several orientations as target groups clear; the source does not show a new manual swipe. The translucent shell remains a depth boundary.

Why can I see a color that I cannot tap yet?
The translucent layers show covered rear faces. Tap only the matching face that is exposed in the current orientation and target row.
What is the final gray shape?
It is the remaining shell/ring after the colored groups have cleared. Finish that target phase and wait for the completion reward.