• ✓Real Thai money, ฿1 to ฿1000
• ✓The stallholder's method first: count UP from the price, 87 → 90 → 100 — never subtract
• ✓Any combination that totals right is right — a real stall does not care how ฿13 is made up
• ✓Every amount checked by npm run verify:money
• ✓A wrong tray is answered as a distance — ฿4 short, ฿6 over — never as a verdict
• ✓EQ: the second miss buys the counting, and three helped rounds offers a smaller-change rung
• ✓A two-player mode — one minds the stall, one is the customerplanned

✓ = done · ☐ = planned. Every game is built one step at a time like this.