RADICAL DREAMERS -Le Trésor Interdit-

Radical Dreamers is a text-based adventure game taking place after the SNES RPG Chrono Trigger. It aims to tie up a loose end from Chrono Trigger, and features two recurring characters from that game. The story follows the thieves Serge, Kid, and Magil as they sneak into a large and foreboding mansion to find the Frozen Flame.

[From chronocompendium.com]

Was later remade into the 1999 role-playing game Chrono Cross.