
To complete the stage you must defeat 50 of the goons before they reach the counter. You move up and down between eight or so planes and the milkshakes do throw straight, but the isometric perspective makes it very difficult to aim perfectly at each goon.
The first mini-game is throwing milkshakes at Biff's goons but the aiming is quite bad. Ironically enough, the mini-games are more faithful to the movie than the rest of the game but are just horrendous:. Despite being able to increase the player's speed, the skateboard power-up is dangerous because it makes it harder to dodge obstacles. The walking levels are the bulk of the game, 15 stages total. This might have been caused by a limitation of the NES system (the NES was limited to three colors for a sprite), but couldn't they have made it so that he at least wore an orange shirt, hair, and shoes, as well as his blue jacket, to make him look more like he has his famous vest? Marty looks nothing like he did in the film, as he wears a black sleeveless shirt (walking stages) and a blue suit (guitar stage) in the game instead of the blue denim jacket below an orange vest he wears in the movie.
The game is barely faithful to the movie by any means necessary.