You are the navigator: the chart holds ★ beacons and 🌀 storm cells.
Assemble f(x) with the pad or your keyboard (sin/cos/tan/√/e supported, 2x needs no ×) so the course穿过全部航标、避开风暴——On submit, a boat sails along your curve collecting stars!
⌨ 数字 · x · + − * / · ^ ² · | · () · S C T R E · Backspace delete · Delete clear · Enter sail