Chicken Crystals

Crystals sit across the board in different colors. Tap two crystals of the same color. If a clear path of empty cells exists between them - moving up, down, left, or right without crossing other crystals - they merge into a single new crystal. The new crystal appears where the first one was. The second crystal vanishes. The cells between them stay empty.
A spare crystal waits below the board. When you cannot find any valid pair to merge on the board, tap the spare. It jumps onto an empty cell. If that placement creates a new merge opportunity, the game continues. Every successful merge after using the spare triggers another jump. The spare replenishes itself and can be used multiple times during a session.
The board fills gradually. Merges clear space by turning two crystals into one. But new crystals do not spawn on their own. Only the spare can add more crystals to the field. You have to manage the limited number of crystals on the board carefully.
The game ends when no merges are possible and the spare cannot be placed anywhere because the board has no empty cells left.
A local leaderboard saves your best scores. The score is based on the total number of merges completed in a session.
When the game ends, a result screen appears. A hen walks along a path at the bottom. The score counts upward from zero. The hen moves forward as the score rises. When the counting stops, she stops.
Tap matching crystals with a clear path between them. Merge them into one. Use the spare when stuck. Watch the hen walk your total.