The highest ending rank is A, reached with at least 70,000G remaining at the ending. Rank B begins at 30,000G; lower balances receive C. There is no S rank. Money already spent does not remain in the ending balance.
Search while progressing
Vacuum curtains, bed sheets and suspicious furniture. Open hidden chests and restore missing objects with Dark-Light. Capture gold ghosts promptly and collect their drops before leaving. Large treasure rooms such as Royal Coffers and the Dance Hall vault are especially useful.
Avoid unnecessary spending
Gem and Boo finders can help locate a final collectible but reduce the balance. Use the floor and colour guides first. Gold Bones provide insurance against a defeat; buy only what you need if the current balance is close to a rank threshold.
Check before following Mario
Finish money collection before entering the rooftop sequence from the Master Suite. Check the current balance in the pause menu and leave a buffer above the threshold. Gems, captured Boos and play time do not directly change the rank.
Cumulative collection achievements
The coin, bill, gold-bar and pearl achievements use their own collected-item totals. A high money balance is not proof that every item-count achievement is complete. Check those four counters separately in E. Gadd’s achievement list.