How to clear Star Stage in Space Zone in Super Mario Land 2: 6 Golden Coins.

How to Clear Star Stage
This level automatically moves from right to left.
In this level, if you hold the jump button, you will keep floating upward until you let go of the button.
The angry Stars in this level will hurt you if you make contact with them, so try to avoid touching them.
Go to the right and get the coins near the ground, then go up and to the right to get the three coins, and another three coins above and to the right.
Next, go slightly downward as you go right, to find another three coins, and beware of the star that moves up and down beneath them. To the right of the moving star, there are three more coins.
Start going up and to the right again. There is a star going up and down, and there are three coins to the right of it. Then stay at the same height where the coins were, then when you go past the star overhead, watch out for another star that goes up and down. To the right of that star, there are coins within a corridor of stars, followed by a ? Block with a Super Mushroom on top of it. The ? Block contains a coin.
Stay near the ceiling after the ? Block, because there is a V-shaped corridor of stars beneath you that has a moving star going up and down within it, so it is difficult to navigate, but if you stay near the ceiling, you can avoid it entirely.
After the V-shaped star formation, go downward, and you will see a moving star on the right, with some coins just after it. Go downward from those coins to get another set of coins, then go upward to find another a ? Block that contains a Super Mushroom or Fire Flower, and a few coins above the ? Block.
Go past the moving star to the right of the ? Block, then start going slightly upward. There is a wall of stars to the right. When you get past them, go downward, and wait for the moving star to move out of the way before you go past it. Then quickly go up and hit the ? Block to get a Super Mushroom or Fire Flower.
Then immediately go downward, and dodge the Tosenbo that is floating in that area (you can safely touch it if it's deflated), to try to get the eight coins near the floor, then immediately go upward, and dodge the moving star to try to get the two sets of three coins up above.
Then go to the right, past the wall of stars. There is a Tosenbo floating to the left of a bunch of coins, so try to go past the Tosenbo when it's deflated, or hit it with a fireball when it's inflated, then get the coins, and get past the Tosenbo on the other side.
Next there is a corridor of stars with a couple of moving stars in it and a number of coins.
Stay near the same height as you go to the right from that corridor, and look for a ? Block. It contains one coin. There is a moving star right after it. Go upward after that ? Block to find another ? Block that contains a coin.
After several more stars, including some moving stars, there are three rows of ? Blocks. Since the level automatically scrolls, you probably only have time to hit one row of ? Blocks. The bottom row has an invincibility star in the final block (but there is a Tosenbo just after that block that you have to try to go past when it's deflated), and the middle row has a Super Mushroom or Fire Flower in the fourth block from the right. The invincibility star will let you safely float through the angry Stars without getting hurt, until the effect wears off.
After that, hit the Midway Bell, and if you got the invincibility star, you can just go straight up through the stars to reach a Brick that has a Super Mushroom on top. Otherwise, you have to go downward from the Midway Bell until you can go up through a passageway made of stars, and try to go to the left before the Super Mushroom scrolls off-screen.
From there, go to the right, where there is a narrow downward passageway of stars, with three coins at the bottom. Then go diagonally up and to the right to try to get the coins up above. Then go downward and avoid the Tosenbo at the bottom, and go diagonally up and to the right.
The level will stop automatically scrolling. Hit the ? Block to get a Super Mushroom or Fire Flower, then go through the pipe on the right to face the boss of Space Zone.
Tatanga
Tatanga makes a return from Super Mario Land. Tatanga shoots a curved beam straight ahead, and drops round bombs that fall to the ground, then move straight across the screen, then as soon as Mario is above the bomb, it shoots a flare straight up at Mario, which explodes.
To avoid the curved beams, don't be in front of Tatanga, and to avoid the bombs, don't be on the ground. Try to stay just below the level of the curved beams so you have enough time to move left or right to avoid the flare from the bomb.
Whenever Tatanga swoops down in a U-shape, try to stomp on top of his spaceship to damage him. You can also throw fireballs at him to inflict some damage.
Keep using this strategy until Tatanga is defeated.
After the Battle
After you defeat Tatanga, the Space Coin appears and goes into the gate at Wario's Castle. An "X" flag appears above Space Zone in the northeast part of the map (but you can still redo the levels there if you wish).
If you got all six golden coins, you can now proceed to Wario's Castle in the middle of the map. The entrance accessible from the southern part of the map, near Tree Zone.
Now you can go to any of the other zones: