Gameplay alternates between the characters of Dr. Jekyll and Mr. Hyde based on the player's ability to either avoid or cause damage.

The story of the game is based on Robert Louis Stevenson's novel, with Dr. Jekyll on the way to his forthcoming wedding to Miss Millicent.

As Dr. Jekyll walks to the church with his cane in hand, several townspeople, animals, and other obstacles obstruct his path, causing him to become angry.

The gameplay then moves to a demonic world, where Hyde will fire out a "psycho wave" at various monsters.

[4] As Mr. Hyde kills these monsters, his anger abates and he eventually transforms back into Dr.

The Japanese version follows this order: City, Park, Alley, Town, Cemetery, Street.

At this point, the level is mirrored horizontally and Mr. Hyde walks from right to left with the screen autoscrolling.