Jikuu Yuten: Debias

Jikuu Yuten: Debias (時空勇伝DEBIAS) is a action-RPG game developed by Now Production for the Famicom and published in Japan by Namco. It was never released outside of Japan, and was never translated into any other language. It came with an accessory, a pair of discs which were meant to be overlaid with one another. At various point in the game, the player was instructed to point the top disc to a particular symbol on the bottom disc and report the results to determine certain outcomes.