Defeat Bowser in World 6 to unlock World Star, then spend 90 Star Coins at its entrance sign. The World 1-Tower cannon leads to World Mushroom, not World Star. The three large collectibles in each World Star course are Moon Coins.
World Star-1
- Moon Coin 1 — Press the P Switch near the coin, then drop through the openings below. A lower platform catches you. Enter the pipe there to be launched through the coin.
- Moon Coin 2 — Ground Pound through some of the blocks in front of the coin, then throw a Koopa shell to break the remaining blocks.
- Moon Coin 3 — Collect the visible coin before pressing the nearby P Switch; activating the switch too early changes the route you need.
World Star-2
- Moon Coin 1 — Collect the coin visible along the main platforming route, making sure you have a safe landing.
- Moon Coin 2 — After the Checkpoint Flag, pick up the red Koopa Troopa’s shell and throw it through the coin.
- Moon Coin 3 — Stand on the middle Donut Block and let it lower you toward the coin. Jump away once you have collected it.
World Star-3
- Moon Coin 1 — In the water, look for the opening in the floor to the left of the blue pipe. Swim down through it to reach the coin.
- Moon Coin 2 — Reveal the three Brick Blocks above the platforms. Build up speed and perform a Triple Jump, taking the final jump from the three blocks to reach the coin’s height.
- Moon Coin 3 — Above the Thwomp near the Red Ring are two platforms. Reveal the invisible Vine block over the left platform and climb to the coin.
World Star-4
- Moon Coin 1 — Before the Checkpoint Flag, look left toward the raised platform for the coin.
- Moon Coin 2 — Bring a Mini Mushroom. Near the end of the course, enter the tiny green pipe before the normal-sized green pipe to reach the coin.
- Moon Coin 3 — Just before the goal, collect the coin floating low over the water.
World Star-5
- Moon Coin 1 — Take Lakitu’s Cloud as soon as you can. Fly up near the ? Blocks and follow the coin trail to the Moon Coin.
- Moon Coin 2 — Remove the Koopa from the platform on the right before approaching the visible coin.
- Moon Coin 3 — Near the goal, take another Lakitu’s Cloud. Fly upward beside the pair of raised platforms and enter the high pipe for the final coin.
World Star-6
- Moon Coin 1 — Swim upward through the middle of the area to approach the visible coin while avoiding the Fishbones.
- Moon Coin 2 — Enter the purple pipe to reach the coin’s bonus room.
- Moon Coin 3 — The coin is visible on the main route. Watch the Fishbones and wait for a clear path before swimming in.
World Star-7
- Moon Coin 1 — Jump onto the Donut Block and collect the coin promptly before the block falls too far.
- Moon Coin 2 — After the Checkpoint Flag, reveal the Vine between two ? Blocks. Climb it and follow the upper route to the coin.
- Moon Coin 3 — The coin hangs in a gap between the lava hazards. Time your jump to collect it and land on solid ground; the lava itself is not safe to touch.
World Star-Castle
- Moon Coin 1 — Climb to the coin at the lower fence, moving away before the electrical hazard reaches you.
- Moon Coin 2 — Use the Donut Platform to reach the visible coin, then jump back before the platform falls into danger.
- Moon Coin 3 — Run ahead along the moving green blocks and climb the first fence to reveal the coin. Collect it, then return quickly to the blocks and take cover behind the wall.
- Dry Bowser — When he jumps, run underneath and press the switch behind him. In the giant phase, stay on a platform until he commits to a swipe, then jump to the next one. Climb steadily, jumping over his fire at the intermediate stops and avoiding the fire-spitting statues higher up. Reach and press the large switch at the top to end the battle.