To travel from one world to another you need to have a Gummi Ship. Gummi Ships are built buy Gummi Blocks. You will find blocks in chests, from Heartless Ships and you can buy them later on in the game. You will start out with the Kingdom Ship. This is a very weak but basic Gummi Ship and will be your only one initially.
You can upgrade it until you can make you own brand new ship later on. But you don’t have to make a whole new ship yourself. You can pick up Blueprints throughout the game. The Blueprints are Gummi Ships that have already been made for you. All you need is the Gummi Blocks to build it.
There are 3 rules when it comes to building a Gummi ship.
That’s all there is to it. When you are at the Worlds Screen press the Square Button to go into the Gummi Garage. Chip and Dale will tell you a tutorial on how to do things. Read it and try to remember as much of it as you can. Then when it’s over select Garage and then either pick a pre-made Blueprint. Or pick a fresh new one. Now you will be at a screen where you can see the Gummi Ship close up with a blue background. Now read below for the controls to use in this area. Trust me, trying to figure this out on your own is a pain in the butt.
There are 3 different modes here. Select Mode is when you have a Gummi Block highlighted and you can switch between other Gummies. Build Mode is when you have chosen a Gummi Block and it is on the screen ready to be placed on the ship. Inspect Mode is when you have completed your ship and you would like a better look at, look at its status and see if it is flyable.