How do the key boxes work in Level 498?

Purple reveals cyan above the counter; the later yellow key clears the right-side covered access. Each unlock follows the key receiver's completion.

What is the safe opening?

Yellow is already in slot 1. Keep it active, add blue and pink, then wait for pale pink or cream to approach.

Beads Out level guide

expert 12 colors

Level 498 starts with yellow preloaded in slot 1 and combines hidden tails, two keys, and a reserve counter that progresses 5 to 4 to 3 to 2 to 0.

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Keep preloaded yellow in slot 1; add blue and pink to open slots, reserving the fourth until pale pink or cream approaches.
Complete the opening receivers when their second matching bands rotate to the outlet.
Complete the purple key box with purple at the outlet; its departure removes the cover above the left counter and reveals cyan.
Select revealed cyan only after it becomes selectable; opening completions move the counter 5 to 4, then 4 to 3.
Complete the later yellow key box; it clears the right-side covered access, whose revealed box enters only after yellow leaves.
Cycle navy, red, cyan, and pink as hidden feeder bands reveal.
Keep the counter in reserve as completions move it 3 to 2 to 0; its resolution releases the remaining counter-side access.
Clear blue, orange, red, purple, green, and cream from the reduced reserve.
Let the final receiver depart and confirm `Congrats`.

Colors in this level:

Yellow, Blue, Pink, Pale-pink, Cream, Purple, Orange, Navy, Red, Cyan, Gray, Green

Trying to operate a lock directly instead of completing its key box.
Trying to activate left 5 as a gray receiver or selecting a box before its key removes the cover.

Board notes 5 details

Layout: Two question-mark feeders enter a compact oval above a split reserve with temporary covers, a blue divider, left counter 5, and purple and yellow key boxes.
Goal: Clear visible bands, complete both key-bearing receivers, advance the left counter through 5, 4, 3, 2, and 0, and empty both concealed tails.
Opening: Yellow is preloaded in slot 1; keep it there, add blue and pink, and reserve the fourth slot until pale pink or cream approaches.
Danger Zone: Key and percentage receivers can overlap; filling all four slots before a reveal blocks the next numbered-phase color.
Mechanics: The non-selectable left counter visibly progresses 5 to 4 to 3 to 2 to 0. Purple reveals cyan above it; the later yellow key clears right-side access.

How do the key boxes work in Level 498?
Purple reveals cyan above the counter; the later yellow key clears the right-side covered access. Each unlock follows the key receiver's completion.
What is the safe opening?
Yellow is already in slot 1. Keep it active, add blue and pink, then wait for pale pink or cream to approach.