After you encounter Uncle Steve in the underground ruins, you arrive at the alien spaceship, where you must find the three magic cubes.

Explore the Spaceship

Go north and enter the spaceship. Then go north from the entrance. Pick up the four hearts, dodge the bullets from the turrets, and go north. Avoid the robot and continue going north. Jump on the tiles but don't get the capsule yet. Kill the turrets if possible, and go to the northeast tile. Hit the north wall until it breaks open. Go in and get the Baseball Cleats. Go south to exit the room.

Pick up the Capsule. It will temporarily fill your health and increase your maximum hearts to 22, but the extra hearts will disappear over time. As they disappear, they make a sound effect that sounds like a switch appearing. Jump east to the metal platform, then go east to the next room.

Go south to the next room. Carefully jump east on the tiles until you can pick up the laser gun, but be careful to avoid the robots and the bullets they shoot out. Go west and get the four hearts, then step on the nearby tile to be teleported to a different location.

Go east and step on the easternmost tile.

Avoid the robot and jump east, then go south to the next room.

As you go south, try not to stay still, because a robot on a hoverbike will fly across the room. Go south to the next room.

Go west, and you can optionally use the Baseball Cleats repeatedly to kill the robots. Then jump south to the narrow platform along the south wall. Go west to the next room.

Jump west and try to kill the hoverbike robots before they can hit you. The cleats kill them in one hit. At the west side of the platform, jump north to get the laser gun, then jump west and step on the tile to be teleported.

Go east to step on the tile and be teleported again.

Go west from there, and you will have to battle the Jetpack Jumpers.