In Kingdom Hearts, the Keyholes were sealed, leaving no way to travel between each world. About a year later, the Heartless found another method of traveling between worlds, creating their own Gates. A good portion of the Gates are revealed in Kingdom Hearts II.
The Gates are opened by the item in question (see below) is surrounded in light and then a huge gust of wind blows. The item in question reveals the keyhole to a route and then Sora spins his Keyblade and unseals the Gate. Sora, Donald and Goofy continue on their adventures there after with the new route opened.
It's likely that Worlds within worlds do not have Gates, because the outer world's Gate also serves as their own. This could be true for Space Paranoids, 100 Acre Wood, and Timeless River.
List of Gates
| Kingdom Hearts II
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| Characters
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| Party members
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Roxas - Sora - Donald Duck - Goofy
Fa Mulan - Beast - Auron - Jack Sparrow - Aladdin - Jack Skellington - Simba - Tron - Riku
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| Summons
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| Chicken Little - Genie - Stitch - Peter Pan
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| Antagonists
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Organization XIII
Xemnas - Xigbar - Xaldin - Saïx - Axel - Demyx - Luxord
Villains
Maleficent - Pete - Hades - Ursula - Hector Barbossa - Jafar - Oogie Boogie - Scar
Shan-Yu - Master Control Program - Sark
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| Non-playable characters
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| Abu - Aerith - Ansem the Wise - Ariel - Ariel's Sisters - Auron - Bathtub - Belle - Biggs - Captain Pete - Carpet - Cave of Wonders Guardian - Cerberus - Chien Po, Ling, and Yao - Chip - Chip and Dale - Christmas Elves - Cid - Clara Cluck - Clarabelle Cow - Cloud - Cogsworth - Daisy Duck - Dark Figure - Dr. Finkelstein - Eeyore - Elizabeth Swann - Enchanted Brooms - Flora, Fauna, and Merryweather - Flotsam and Jetsam - Flounder - Fuu - Gopher - Gullwings - Hayabusa - Hayner - Hercules - Horace Horsecollar - Hostile Program - Huey, Dewey, and Louie - Hydra - Iago - Jasmine - Jessie - Jiminy Cricket - Kairi - Kanga - King Triton - Li Shang - Lock, Shock, and Barrel - Lumière - Maleficent's Raven - Megara - Merlin - Mickey Mouse - Minnie Mouse - Moogles - Mrs. Potts - Mufasa - Mushu - Nala - Naminé - Olette - Owl - Pain and Panic - Pegasus - Pence - Philoctetes - Piglet - Pluto - Prince Eric - Pumbaa - Rabbit - Rafiki - Rai - Reindeer - Rock Titan - Roo - Sally - Santa Claus - Scrooge McDuck - Sebastian - Seifer - Selphie - Sephiroth - Setzer - Shenzi, Banzai, and Ed - Simba and Nala's cub - Squall Leonhart - Terra-Xehanort - The Emperor - The Experiment - The Ghost of Scar - The Mayor - The Peddler - Tifa - Tigger - Timon - Tinker Bell - Undead Pirates - Vivi - Wallace - Wantz - Wardrobe - William Turner - Winnie the Pooh - Wedge - Yen Sid - Yuffie - Zero
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| Locations
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| Worlds
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| Twilight Town - Destiny Islands - Hollow Bastion/Radiant Garden - The Land of Dragons - Beast's Castle - 100 Acre Wood - Olympus Coliseum - Disney Castle - Timeless River - Atlantica - Port Royal - Agrabah - Halloween Town - Pride Lands - Space Paranoids - The World That Never Was - End of Sea
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| Places
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| The Other Twilight Town - Dive to the Heart - Mysterious Tower - Kingdom Hearts
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| Terms
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| Cornerstone of Light - Drive Form - Gate - Hollow Bastion Restoration Committee - Kairi's Letter - Keyblade - Kingdom Hearts Encoder - Organization XIII - Princesses of Heart - Reaction Command - Secret Ansem Report - Sidecar Glider - Skateboard - The End - Twilight Town Disciplinary Committee
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| Music
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| Kingdom Hearts II Original Soundtrack - Kingdom Hearts Original Soundtrack Complete - Sanctuary
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| Archives
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| Accessories - Artwork - Bosses - Enemies - Items - Keyblades - Other Weapons - Songs - Removed content
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