Unlock: Jukebox Bus

1. Go to 1-3.

2. From the first island, jump to the second island.

3. After hitting the boost panel a few times (by driving in circles), Instead of jumping to the island on the left, use the trampoline to jump straight ahead to a secret island (it can be briefly seen when you start the level in the flyover).

4. Drive through the star!

Unlock: Bank Bus

1. Go to 2-2.

2. Notice in the flyover (when you start the level), the bumper in the bottom left corner has yellow on it!

3. Turn around and hit that bumper 3 times (Nothing will happen the first time, it will turn yellow the second time, it will glow then turn into the star the third time).

4. Drive through the star!

Unlock: Shark Bus

1. Go to 3-3.

2. Drive along the first two satellites like normal.

3. When you get to the first space station, drive around like you normally would, but when you get about halfway, turn and fall off towards the centre. (if you were to drive straight up when you land on the space station, you would go over a beam and into a blackhole. The star is underneath this beam and is where you should aim).

Unlock: Bumper Bus

1. Go to 4-6.

2. Jump onto the bridge.

3. Stay close to one of the edges and drive around the first hole, then jump back onto the first platform.

4. Drive around in circles until the bridge is upside down.

5. Jump back onto the bridge and get to the end like normal (instead of bowling pins, the star will now be there)!

6. Drive through the Star!

Unlock: Omni Bus

1. Go to 5-4.

2. If you turn right at the start, you should see the star on an island behind a big red bumper and a big blue bumper!

3. Now that you roughly know where to aim, restart the level.

4. drive over the first three speed boosts (like normal), but turn left before the trampoline.

5. Continue turning left so that you drive over one of the boosts again, then turn right and drive along the perimeter of the first island. (See the picture below).

6. When you get to the trampoline, line yourself up so you’re facing the island with the star. (This may take several attempts, but this is the easiest way)!

7. Use the bus’ ability to stop from overshooting.

8. Land on the island and drive through the star!

You should now have unlocked all star levels!

Hopefully this guide saved you some sanity (which is more than can be said for me)

If anything is unclear, leave a comment and I'll try to explain it better!

Thanks for reading^^