Custom color mahjong developmentNorthern‑california‑college‑town‑hobby‑meetup‑groups‑in‑Chico‑keep‑shared‑communal‑mahjong‑tile‑sets‑so‑individual‑group‑participants‑do‑not‑need‑to‑own‑personal‑game‑equipment‑to‑attend‑weekly‑scheduled‑public‑tile‑game‑play‑sessions‑together.