This first level serves as an introduction to the new power-up of Super Mario 3D World, the Super Bell. Not far from your starting position, find a ? Block that you can hit to retrieve a Super Bell, which grants you the Cat Power-Up. Take some time during this level to get used to the Cat Power-Up, it’s a big upgrade over basic running and jumping.
Goombas are the first enemies you’ll face. They aren’t too threatening by themselves. Be careful you don’t get surprised by them, as they use the Clear Pipes to get around. You can defeat them if you crash into them by using the same pipe they are using. Jump on them or Claw at them with your Cat Power-Up claws!
Green Star #1
The first Green Star you’ll collect can be reached by taking the Clear Pipe underneath it; you’ll shoot yourself right into it. You can also approach the star by climbing along the walls while wearing a Cat Power-Up. Try to avoid falling into the bottomless pit below the Green Star!
This last Clear Pipe will send you to the second half of 1-1, and the mid-way Checkpoint Flag. If you stand on the wooden platform next to the Sprixie with the binoculars, you can look into the distance at the rest of the level, prepare for what awaits you, and see where the Goal Pole is.
Green Star #2
The second Green Star can be found by catching a Rabbit as it hops around a circular pond filled with Coins. You can do this simply by dashing at the Rabbit, but catching it is easier with the Cat Power-Up. You can Claw Dive over the pond to surprise it before it starts running, and the Claw lets you reach it from father away.
Stamp
The pipehere leads to a hidden side room that contains a Clear Pipe that you can use to reach your first collectible Stamp.
Green Star #3
Reaching the third Green Star takes a bit of doing. First, climb up the wall above the pipe to reach the top of the small mountain (5). You’ll find a series of Rock Blocks that you can’t break open just yet (and a green + Clock on top of those bricks), and two Rabbits. Chase down and touch the larger Mega Rabbit to receive a Mega Mushroom.
The Mega Mushroom makes you essentially invincible and super huge, and you can shatter most breakable blocks by walking into them or simply by using a ground pound next to them. (6) Your goal is to cross the bridge to reach the final section while staying Mega-sized. Cat Goombas will try to stop you, but they’re helpless before a titan!
It’s tempting to mess around on the bridge with Mega Mushroom-powered ground pounds, but keep moving! You need to be Mega-sized when you reach the giant Rock Blocks (7) to break through them and reach the chamber holding the final Green Star. Alternatively, you can use the Cat Power-Up to dive into the chamber with the star. Use the nearby Warp Box to get back to the main path.
After collecting the third Green Star and using the Warp Box, you are now in front of a wall with cat paw-marked ramps on either side of a Clear Pipe. The Cat Power-Up lets you zip up the wall to collect Coins, while the pipe just takes you to the top of the hill.
However you managed to get past the wall, you’ve reached the Goal Pole! Remember, to fully complete the game, you must collect all of the Green Stars, find all of the Stamps, and reach the top of every single Goal Pole. You can make the last bit much easier by using the Cat Power-Up, it can climb a short distance up the poles.