Erika to Satoru no Yume Bōken[a] is a 1988 Japan-exclusive adventure video game for the Family Computer.

One night, a cat-like being gave them a mission to search for a powerful crown that will alter time and space for the person who possesses it.

Players are forced to control both Erika and Satoru simultaneously, causing them to interact with their surroundings at the same time.

Interacting with characters and doing their quests will bring players one step closer to retrieving the Time Crown, the item needed to win the game.

[8] Satoru has the weakness of being able to drown, unlike his sister Erika, who can swim in the water levels of the game.