EcoQuest 2: Lost Secret of the Rainforest, is an educational, adventure point and click game released by Sierra On-Line in 1991. The game was released for PC (DOS / Windows).

In Lost Secret of the Rainforest, the second installment in the series, Adam, now slightly older and able to speak with animals as a matter of course, explores the tropical rainforest in search of a cure of a disease afflicting the local natives, and a way to save the rainforest from destruction. One of the game's innovations was the "Ecorder" display: a tricorder-like device Adam uses to learn about things he finds during his journey. According to Pelit, the game is somewhat harder than its predecessor and places more emphasis on the dangers of selfishness and greed, as opposed to the blight of man.