This guide will show you how to unlock all 7 Car Shapes.
You can unlock 6 additional car shapes throughout the game (so far). To do this you will need to find the secret exit (the green triangle) for each world. Most of them are hidden pretty well and require power-ups that you only unlock towards the end of the world, so they’re easy to miss.
This one is a bit sneaky. To start, head to level 1-4. You will need to get underneath that pink block that is laying on its side to your left. You’ll notice that there is a small gap between the pink block and the edge of the platform level 1-4 is on. You can actually wedge your car into that gap and drive forward to move the pink platform out of the way and fall below, it is a bit finicky but keep at it. Beyond this it is a matter of driving left into the secret exit.
World 2 Secret Exit
This one is easy enough once you know where to go. Starting from level 2-6, drive along and up the rotating orange platforms and fly up the side of the wall with a balloon. You will likely not have that much balloon power left so you may want to opt for using the inflate power to begin with to gain extra height. Once you reach the top of the wall, drive left and fall below. It may take you a couple of tries to fall in the right spot, but, provided you have a small amount of the balloon power left, and the inflate power to take up more space on your descent, you should be able to land onto the secret exit. There are also a couple of arrows to guide you in your descent.
World 3 Secret Exit
This one is quite easy. Starting from level 3-1, drive left and use the sticky wheels power-up to drive down along the left wall, just before the out of bounds area. Continue to drive down and you will hit the underside of the platform and drive upside down. You should be able to see the secret exit right below you, disable the sticky wheels to fall and grab it.
World 4 Secret Exit
This one is simple but you will need to wrangle with the rocket power-up. Starting from level 4-6, fly almost directly up. You will begin to be funnelled by two platforms with no traction that help to angle you towards the secret exit.
World 5 Secret Exit
This one is similar to world 4’s secret exit in that it will be centred around using the rocket power-up. This secret exit is often in plain view as it is, orbiting around level 5-8. I find the easiest way to pursue the secret exit is to start from level 5-7 and rocket up to the above platform on the left and wait for the secret exit to whizz by. It may take a couple attempts, but it is just a matter of catching it with the rocket power-up as it flies by.
World 6 Secret Exit
This one is surely the hardest, in being the most well hidden and difficulty. You will need the antenna power-up as well as the grapple power-up. Starting from level 6-7, drive through to the right side of the pink gravity flipping zone. Gain some momentum and start driving back through the pink gravity zone and then flip it with the antenna power-up. This will send you up in the air towards a platform up and to the left of level 6-7. You will likely need to use the grapple power-up to assure your landing on the platform.
Once you are on top of the platform, you will need to gain as much momentum as you can driving left and toggle the antenna on as you depart from the platform. You will drive off the platform into another pink gravity zone, which will reverse your downward momentum as you pass though it. Provided you had enough momentum, you will make it to the second platform, although if you may have to use the grapple again to assure your landing.
From this second platform, there will be another pink gravity zone to your left, this time oriented on its side, being able to be flipped from left to right. Drive leftward into the zone, here you can either opt to point your car up and go for your grapple to assure your landing to be safe, or orient your car with the wheels pointing leftward to land on the platform. Here you can use the sideways gravity to drive along the sideways platform. Driving halfway up the pink gravity zone, you will need to flip the gravity to swap sides to continue driving up. Once you reach the top of the wall, you can flip the gravity to fall into the secret exit. If you happen to miss the secret exit as you are gliding towards it, don’t forget that the grapple power-up can also grab onto exits and allow you to pull yourself into them, sealing the final step.