GrainCascade

Tap a chalk-drawn circle to add one charge unit. Circles have a capacity; exceeding it triggers an overflow that permanently sends one unit to each connected neighbor, which can cascade further. Goal: reach the exact required charge on all target circles using the fewest taps, without ever overflowing a protected circle. States: Below capacity (accepts charge) / At capacity (about to overflow) / Overflowing (resets to zero, distributes to neighbors). Fail: A protected circle overflows. Phases: 1–7 small networks, single overflow / 8–13 larger networks, chained cascades / 14–20 protected circles, tighter capacity margins. Stats: Diagrams Solved, Minimum-Tap Solves, Levels Cleared.