The game uses a simple point-and-click mechanic which involves using a cursor to guide Nicholas Weintraub to various locations. Nick will react to what the player does and what he encounters in the game by expressing curiosity, getting mad, falling down, running away, standing his ground, or other actions. At certain points, the player is able to have Nick perform a special move that generally involves having him stomp on an onscreen enemy.
Mini-games, such as having Nick fly an airplane or ski down a mountain, are available throughout the game. Special souvenirs may be uncovered as well, which are displayed in Nicholas's room at the end of the game, such as Daisy's collar or Samantha's glasses.
One night, a mischievous ghost traps a sleep-walking Nicholas Weintraub inside a magic mirror. Stuck in an alternate universe that strangely resembles his own house, Nick yearns to get back through the mirror to his own house and his own bed. The player must direct Nick to outwit enemies and pull gags in order to get past enemies and the aforementioned ghost and recover the broken mirror pieces he needs to go home again and search for twelve magic stars and items needed to help him throughout his quest. Whenever he finds a piece, it will fly back to the mirror and put itself back in place. After repairing the mirror, he prepares to leave but the ghost stops him revealing that it only brought him here so he can have someone to play with. The player could either chose to stay or go. If the player chooses to stay, the ghost then runs off, leaving Nick stuck in the alternate world until he reenters the mirror room where the leave or stay process repeats. If the player chooses to leave, Nicholas says goodbye to the ghost and begins to go home, but the ghost decides to go with him. However, if the player doesn't find all the mirror pieces and has only found at least eight pieces, Nick can still leave, but the ghost can't leave with him at all. After Nick wakes up, he goes downstairs to check the Internet, then get something to eat and a model of the ghost is shown hanging on the ceiling fan and the ghost's laughter is heard. Nick hears this, therefore bewildering him.