Crown of the Aero Tree

"It's just color sorting! Easy!"

IronBaker's hands were a blur as she picked up the crystals and slotted them into the matching pipes.

Red was in.

Yellow was in.

Blue...

"Wait."

Harper suddenly grabbed her hand.

"What's up?" IronBaker blinked.

Harper pointed to the blue slot.

"There's a tiny purple mark next to the blue slot. And a small orange mark next to the yellow one."

Harper narrowed her eye