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This track takes place in a grassy area. The bloons' path is marked by yellow bricks, hence the name. There's no water here. Bloons enter from top-left (left side) or top-right (right side), and exit at the bottom of each side.
AI Bloons are always sent from the top-left. On the Flash version, sent bloons go from the bottom, but in Mobile they go from the same entrypoint as the AI.