Guest Star ???? Star Allies Go!

"You cleared it with all of your friends! Lots of friends have now become Star Heroes!"

- Announcement

'''Guest Star ???? Star Allies Go!' is a sub-game that appears in Kirby Star Allies.'' This sub-game acts as the Extra Mode, like Dededetour or Meta Knightmare Returns, but the player is a friend, similarly to Helper to Hero.

Gameplay
In this mode, the player plays as one of the game's friends and tries to traverse through the five worlds of the game as quickly as possible. The levels are almost identical to those from the story mode; however, some aspects vary:
 * All 1UPs, most food, and most Picture Pieces are replaced with point stars. Maxim Tomatoes become standard food items.
 * There are additional Room Guarders dispersed throughout the stages, which typically reward Power-Up Hearts.
 * Certain round-trip doors are inaccessible, being replaced with a collectible.
 * Some rooms only appear for specific Friends, generally tied to their abilities.
 * Some rooms are removed altogether, including all Friend Star sequences.
 * Some Dream Friends experience additional, unique rooms not seen outside of the Guest Star game.
 * There is a unique final boss, Morpho Knight, fought after Hyness instead of Void Termina.

Instead of rare Picture Pieces, players may collect Power-Up Hearts to increase their attack, speed, and health stats. Starting stats, especially health, are lower than base stats in Story Mode, so earning Power-Up Hearts is important for a successful attempt. In this sub-game, all point stars are heart-shaped rather than star-shaped, as they usually are.

Pressing a Big Switch causes collectibles to spawn, some of which may spawn a Dream Rod (one in Donut Dome for every friend; a second one in Friendly Field if the player uses Sir Kibble, Broom Hatter, or Birdon; and a third one on Planet Earthfall if the player uses a friend capable of doing a Friend Throw, such as Knuckle Joe and Gooey), allowing one to summon a Dream Friend. One must complete this mode as one of the standard friends (e.g. Blade Knight, Burning Leo) in order to unlock the ability to play this mode as a Dream Friend instead. There are five levels, and at the end and midpoint of each level, the player can use a checkpoint to save and return to the title screen of this mode; these checkpoints also fully restore the health of each player. As in story mode, King Dedede and Meta Knight can be made Friends by throwing a Friend Heart at them after their defeat.

If amiibo is used at all during the playthrough, an amiibo insignia will appear next to the player's clear time. Similarily, the game will show if the playthrough was done with two players or more by showing the player number symbols next to the time (P1, P2, P3 and P4)

Playable Characters
The player can choose among 30 characters (three of them are from a post-launch update).

Friends

 * Blade Knight (Staying Sharp)
 * Sir Kibble (Cutting in Style)
 * Poppy Bros. Jr. (Bombs Away!)
 * Rocky (Rock the World)
 * Wester (Wild-West Whip)
 * Bonkers (Banana Mania)
 * Bio Spark (Savage Silence)
 * Gim (Up-and-Down Dynamo)
 * Jammerjab (Staff Striker)
 * Burning Leo (Roaring Fire)
 * Chilly (Chill Winds)
 * Waddle Doo (Beam Land)
 * Plugg (Powered Up)
 * Driblee (Rinse and Repeat)
 * NESP (Psych Out)
 * Birdon (Freedom in the Sky)
 * Broom Hatter (Spring Cleaning)
 * Knuckle Joe (The Contender)
 * Bugzzy (What's the Bug Idea?)
 * Beetley (Unbeatable Beetle)
 * Como (A Tangled Web)
 * Parasol Waddle Dee (Floaty Dreamer)
 * Vividria (A Colorful ♥)
 * Chef Kawasaki (Flavor Attack)

Dream Friends

 * King Dedede (Fight for the Crown)
 * Meta Knight (Scourge of Darkness)
 * Bandana Waddle Dee (The Legend of Dee)
 * Rick & Kine & Coo (The Animal Trio)
 * Marx (Galactic Ambition)
 * Gooey (Who...Me?)

Changes with Dream Friends
After Update 2.0, changes were made to the Guest Star mode that mainly relate to the Wave 1 Dream Friends:
 * When reaching the final boss rush (consisting of Zan Partizanne, Hyness, and Morpho Knight) while playing as either Rick & Kine & Coo, Marx, or Gooey, the arena will be slightly different than the one used in the main story and post-story content. The dark, interstellar background is replaced with a cloudy sky at what appears to be sunset. The background architecture of The Divine Terminus has been flipped upside down, and pieces of it can be seen falling throughout the boss rush. The center of the arena also resembles Hyper Zone, glowing with a light-blue aura. Despite these changes, the gameplay of the boss rush itself remains the same. Divine_Terminus_Sunset.jpg
 * The music in Morpho Knight's boss fight also changes under these conditions. When playing as Rick & Kine & Coo, the music is replaced by a remix of Dark Matter's boss theme and Cloudy Park. When playing as Marx, the music is an orchestral version of Marx's boss theme. When playing as Gooey, a remix of Hyper Zone's first theme plays.
 * When playing as the Wave 1 Dream Friends, new areas which reference levels in previous games appear at the beginning of Level 1, the beginning of Level 3, and the end of Level 5.
 * When playing as Marx, the new levels reference Green Greens, Peanut Plains, and Halfmoon from Kirby Super Star.
 * When playing as Rick & Kine & Coo, the new levels reference Stage 1 of Grass Land, Stage 1 of Red Canyon, and Stages 1 and 7 of Dark Castle from Kirby's Dream Land 2.
 * When playing as Gooey, the new levels reference Stage 1 of Grass Land, Stage 1 of Sand Canyon, and Stages 5 and 6 of Iceberg from Kirby's Dream Land 3.
 * There are rooms resembling HAL Rooms, typically near the end of Guest Star, that contain blocks which spell out the names of either Gooey, Marx, or the Animal Friends' names. Gooey's room plays the Ripple Field stage select theme from Kirby's Dream Land 3, Marx's room plays the title screen theme of Milky Way Wishes, and Rick & Kine & Coo's room plays the title screen theme from Kirby's Dream Land 2.
 * At the end of every Dream Friend's curtain call, a unique picture will appear in the right-hand corner, showcasing a screenshot of them from the game they first appeared in.
 * However, Bandana Waddle Dee's unique picture is from Kirby Super Star Ultra, even thought the first game he appeared was from Kirby Super Star.

Related Quotes
"It’s time for the sidekicks to step up as they race through remixed stages."

- Official Kirby Star Allies website

"“I will be a swordmaster like my idol!” This green warrior swears upon his blade that he will master his weapon, learn how to attack with flame, wind, and lightning, and ultimately conquer the world!"

- Blade Knight

"“Just like my blade, I keep coming back!” What’s inside that armor? Classified! Just like his golden blade, this guy returns to the fight again and again. Pluckiness is the best armor of all!"

- Sir Kibble

"“BOOM! I love that sound!” It’s the guy with the eternal grin! He’s off on an explosive adventure, but all he really wants to do is bring a little fun and fireworks into people’s lives."

- Poppy Bros. Jr.

"“...Hmph! *THUD*” With a will as hard as...something very hard, this rugged fellow is a real heavy hitter. He slides on water or ice and has an uppercut to end any argument!"

- Rocky

"“The world’s treasure is all mine!” With western style and a dandy heart, he takes on any task, all so he can set out again to explore the world! With his flexible whip, he searches for treasure!"

- Wester

"“Ook ook! I love bananas!” He’s always looking for bananas! Even when he loses sight of this goal, this giant gourmand smashes anything in his way, wherever he likes!"

- Bonkers

"“…I will walk the path of mastery.” Under cover of the night, hidden in villages, this elite ninja takes a journey to learn the ninja’s way. With his blade of violet lightning, he speeds through the land!"

- Bio Spark

"“Finally, it’s my turn!” With word of a mechanized invasion in the works, Gim sets out on a journey! What does the robot see? Why does he use his mischievous gimmick? Who knows?"

- Gim

"“Can true believers find their way?” The pink hero taught him that nothing is more precious than friends who believe in each other. And now he sets out to see the truth of this for himself!"

- Jammerjab

"“You set fire to my heart!” Burning Leo, proud of his blazing mane, declares from his heart, “I will go on an adventure and share my flames!” But don’t get carried away. He might burn you!"

- Burning Leo

"“To the edge of the world!” This snowman wishes to travel far before it gets too warm…and he disappears. He sets out from his home, sure that he can achieve his dream!"

- Chilly

"“I’ll bet it all on this beam!” It was the first Copy Ability that anyone ever got, and the origin of all abilities that came later! So much potential from a beam! And now, he wants to see why the beam…bends!"

- Waddle Doo

"“I’m Plugg! What? Never heard of me?” Plugg has been updated to shoot plasma! He might not be well-known, but for all who couldn’t join him now, he will shine brightly for all their sakes!"

- Plugg

"“I’m Driblee! I ♥ clean water!” Driblee can’t stand the destruction of the environment and wishes for only the purest of waters for the world! With that, Driblee sets off on a journey!"

- Driblee

"“Hee hee hee…” Though not quite yet an adult, he brims with the power of a new generation! He predicts there’s something out in the darkness and sets off to find it…with teleportation!"

- NESP

"“Flapping to new horizons!” He hates spending every day stuck in a bird cage and decides to see how high he can fly! And just that easily, he’s off to find freedom. Fly high and fast!"

- Birdon

"“I’ll clean the whole world!” Dust here, dust there! Broom Hatter just can’t stand so much mess. So he takes on the quest of a lifetime: to make the world spotless!"

- Broom Hatter

"“Gonna be the top fighter anywhere!” He’s eager to prove himself in a legendary tournament and sets off at full speed to find it…wherever it is! He’s up for any battle, no matter how tough!"

- Knuckle Joe

"“I was the king of insects!” This aging insect king passed on his title to someone younger. Now he’s off to fight dark forces with techniques that would put a wrestler to shame. What a mandible!"

- Bugzzy

"“I’m the new king of insects!” This young king wants to challenge the old one to see who’s truly mightier. But first…into the darkness! He braves any challenger with his horn!"

- Beetley

"“After years of work…a major role!” He doesn’t just hang around anymore. He’s the three-eyed hero who was nominated by his kind to go on a quest! Now he can snare evil in his web!"

- Como

"“You chose me? Great! Time to sing!” The sun is shining! The parasol’s open! And it’s time for a stroll! That parasol is great protection, after all, and it lets him float sweet as a breeze."

- Parasol Waddle Dee

"“Watch me, sisters! I’ll do my best!” She swears on her ♥ to do her best, so she doesn’t lose to her sisters, not in battle and not in artistry! She sets off to prove herself...and hopefully get into a good art school!"

- Vividria

"“Extreme feast? Eep! I’ll get cooking!” This chef goes on the hunt for ingredients beyond the edge of the world! He senses great deliciousness and must control his hunger until his culinary quest is done!"

- Chef Kawasaki

"“I’ll be the one to keep the peace!” Kirby's first rival, from Kirby's Dream Land, wants to clean up his image, so he's set off to save his people. There's no stopping this self-made king, so watch out, world!"

- King Dedede

"“This darkness must meet my sword!” The Knight that dates back to Kirby’s Adventure joins the fray! This mysterious figure occasionally shows up in his massive ship to stir things up. Now, into darkness!"

- Meta Knight

"“I’m not just a pretty face!” He's got stellar attendance in the Kirby series and deserves a prize. That bandana! That spear! With his courage, he sets himself apart from carefree parasol holders!"

- Bandana Waddle Dee

"“Friends by air, sea, and land!” This triple-deluxe pack of pals from Kirby‘s Dreamland 2 is here to help! You'll here 'em coming: pitter-patter, splish-splash, and flutter-flap!"

- Rick & Kine & Coo

"“Got a plan? Glad to help!” The cosmic jester from Kirby Super Star sensed danger from afar and is ready to roll across galaxies on his ball! This final boss is here to help!"

- Marx

"“My name? Gooey? Maybe?” This googly-eyed wonder from Kirby’s Dream Land 3 comes in search of answers to the big questions in life... Who am I? Where? What time is it?"

- Gooey

Trivia

 * In Level 5, the player's character falls through several rooms containing Room Guarders before moving right to a room with another Room Guarder. The Room Guarder here is based on the player's character. For example, Blade Knight must fight several Blade Knights and Chef Kawasaki must fight Twin Kawasaki.
 * When the player chooses a character, the name of the mode changes. The "????" is replaced with the name of the chosen character and "Star Allies Go!" is replaced with a unique phrase for each character.
 * Through a glitch, it is possible to play as Kirby in this mode. To do this, one must have the Nintendo Switch in Handheld or Tabletop mode, and then tap between New Game and Best Times. If the right place is tapped, the mode will start as Kirby.
 * The credits theme for beating Guest Star mode is a remix of the credit themes from Kirby's Dream Land, Kirby's Adventure, and Kirby Super Star.
 * Gim's special quote implies that he was unaware that the events of Kirby: Planet Robobot have already been resolved. Alternatively, it could suggest that Kirby Star Allies takes place before the events of that game but Gim still somehow knows of the Haltmann Works Company and its ambitions.
 * Prior to the 2.0.0 update, King Dedede, Meta Knight and Bandana Waddle Dee did not have their own unique intro menus and instead shared the standard intro menu that all the other friends shared.