Doraemon (2005) episode 740

It aired on Saturday, 7 January 2023.

Treasure Hunting Paper / Angry Energy Exchanger

It's New Year's Day. Nobita is disappointed when his dad tells him that he can't find the New Year's gift he prepared for him... So Doraemon takes out "Treasure Hunt Paper," a tool used to find important things. When the paper is unfolded and heated by a stove or other source, the letters will appear, revealing the location of the item.