Searchable reference
Stardew Valley The Mysterious Qi Database
The Mysterious Qi records for Casino access, Battery Pack tunnel box, Rainbow Shell Railroad box, 10 Beets in Mayor Lewis' fridge, Solar Essence sand dragon, farmhouse lumber pile Club Card, Oasis Bouncer, Qi Coins, Rarecrow #3, and troubleshooting.
Full Mysterious Qi Quest Route
Checklist / Battery Pack, Rainbow Shell, 10 Beets, Solar Essence, lumber pile, and Club Card
The Mysterious Qi starts in the Bus Stop tunnel and ends with the Club Card hidden in the lumber pile beside the farmhouse. The full route asks for a Battery Pack, Rainbow Shell, 10 Beets, and Solar Essence before Casino access opens.
Battery Pack in the Tunnel
Start / Bus Stop tunnel lock-box and first secret note
Place a Battery Pack in the lock-box panel inside The Tunnel west of the Bus Stop road. This starts the quest and gives the first Qi clue.
Rainbow Shell at the Railroad
Clue / Train platform box and Rainbow Shell timing
After the tunnel clue, place a Rainbow Shell in the box at the Railroad train platform. Rainbow Shell timing can be awkward, so save one from summer beach forage or another source before progressing.
10 Beets in Lewis' Fridge
Crop / Oasis Beet Seeds, Mayor's Manor, and fridge interaction
The next clue asks for 10 Beets in Mayor Lewis' fridge. Buy Beet Seeds from the Oasis, grow them in Fall or the Greenhouse, then use the fridge inside Mayor's Manor.
Give the Sand Dragon Its Final Meal
Desert / Solar Essence, dragon skeleton, and Calico Desert
The sand dragon clue points to the dragon skeleton in Calico Desert. Bring one Solar Essence and interact with the skull area to feed the dragon its final meal.
Farmhouse Lumber Pile Club Card
Reward / Final clue, farmhouse lumber pile, Club Card, and Special Items & Powers
After the sand dragon step, inspect the lumber pile beside the farmhouse to receive the Club Card. The card is tracked in Special Items & Powers and opens Casino access.
Casino Bouncer Access
Casino / Oasis back room, Bouncer removal, Qi Coins, and Rarecrow #3
With the Club Card, the Bouncer no longer blocks the Oasis back room. Enter the Casino to use Qi Coins, CalicoJack, Slot Machines, Rarecrow #3, and Statue Of Endless Fortune planning.
Troubleshooting Missing Steps
Troubleshooting / Forgotten quest state, boxes, fridge, and Club Card checks
Most Mysterious Qi confusion comes from forgetting the current clue, using the wrong box or fridge, missing the lumber pile reward, or trying the Bouncer before the Club Card is tracked.