Well, the world order for kh1 is

 

1. Destiny Islands 
2. Traverse Town 
3. Wonderland 
4. Coliseum 
5. Deep Jungle 
6. Agrabah 
7. Monstro 
8. Atlantica 
9. Halloween Town 
10. Neverland 
11. Hollow Bastion 
12. End of the World

Everyone forgets 100 Acres...

Everyone forgets 100 Acres...

For good reason.

Technically this isn't true cause you have the choice to either go to Wonderland or the Coliseum first and you also get the choice on whether you want to go to Atlantica or Halloween Town. So really it all depends on play style.

Technically this isn't true cause you have the choice to either go to Wonderland or the Coliseum first and you also get the choice on whether you want to go to Atlantica or Halloween Town. So really it all depends on play style.

 

But they have battle level suggestion things that suggest an order.

You FOOL! All of the returning worlds in KH2 are arranged differently.

Technically this isn't true cause you have the choice to either go to Wonderland or the Coliseum first and you also get the choice on whether you want to go to Atlantica or Halloween Town. So really it all depends on play style.

Yes you have a choice, though based on the difficulty level stars, the list shown is the recommended order. (and quite possibly the official order)