Arctic Adventure

The main difference is that the game starts in an overworld map and the player has to enter each of the 20 levels to play them. The last level is blocked and all the other levels have to be completed to access it. Some of the levels are across the icy lakes, requiring the player to obtain a boat from one of the levels to proceed. Some levels are blocked by gates which can be unlocked with keys collected from other levels. During the levels Nevada Smith has infinite lives. He is armed with a pistol with limited ammo, but can be charged up with various pickups. Sometimes passages are blocked by ice blocks which can broken by using up collectable pickaxes. If the player exits a level via a drainpipe, four random bonus levels can be played for additional points. In the last level, the player wins the game and ends the episode by collecting a map piece quarter. (Source: wikipedia)