In Stage 1 of Royal Road, you can find the first Sun Stone during the tank chase sequence.
You'll spot a set of metal blocks with one bomb block.
Destroy the bomb and go down to find the Sun Stone hidden in a barrel.
The next can be found during the cannon sequence.
At one point, you should see a gap in the roof's spikes.
Fire Kirby into that gap to break the blocks and enter the orange star door.
Shift the weights over so that the bottom one no longer blocks the top.
Cut the top weight to break the block and reveal a 3D Warp Star.
Use it to go into the foreground and press a switch.
Return and cut the other weight over the right block.
Inside is the Sun Stone.
During the second sequence with the tank, keep an eye out for a large grate.
Drop through and hit the bomb block to get rid of the tank.
Continue to the right and break the barrel to find a Warp Star.
Open the chest in the background to find the Sun Stone.
Drop off the left side and float toward a small gap to find the Rare Keychain.
In Stage 2, you'll eventually come across a walled-off orange star door.
Hit the switch to remove the walls and enter.
Jump into the water bowl and empty it equally onto the two plants.
Grab the key that sprouts from the right one and jump up the left one to reach the locked
door.
On the other side is the Sun Stone.
During your rematch with Kracko, get it to its second stage and make sure to wait until
it spawns a cannon that will take you to the background.
Just off the edge on the left side is the Rare Keychain.
In Stage 3, you will see the female snow head.
Clear the nearby platform of enemies then pull the head toward the switch.
Hit it and continue to pull the head along as the platforms shift to the right.
Make sure to avoid the blast furnace.
Pull it as close as you can to the male snow head.
Hit the switch and pull them both along the platform as it shifts.
Once you get to the other side, pull the male head down to his body then do the same with
the female head.
They'll give you the Sun Stone for you troubles.
When you come to a wrecking ball near a spiked floor, only pull it back halfway so that the
wall doesn't burst apart.
Use that as a platform to pull back the next wrecking ball the whole way and destroy the
wall.
On the other side, head down the path and get rid of the worm.
Go through the portal and suck up the Waddle Dee train on the left to find the Rare Keychain.
In the section with the lava and the fan platform, make the platform go all the way against the
land so that Kirby can suck up the cork and the rocks on the other side.
Inside the chest is the Sun Stone.
When you get to the missiles being shot at you, climb up the ladder to find a caged orange
star door.
Destroy the missile launcher and go through the door.
On the other side, go past the lever until you reach the laser platform.
Use that to melt the nearby ice and lower the truck.
Pull the truck into the gap and then pull the laser over it and into the large ditch.
Once it melts the ice above, pull the lever to block the laser and retrieve the Sun Stone.
In Stage 4, run past Bandana Waddle Dee and jump in the nearby cannon.
You'll land near a portal but run past it.
Jump in the next cannon to be blasted through a rock containing the Sun Stone.
Before hitting the bomb block that will reveal the stage exit, float to the left side and
destroy the cracked block.
Jump into the cannon and it will eventually blast you to the Rare Keychain.
In Stage 5, jump into the top left portal and travel across the platforms until you
reach Bonkers.
Defeat him and take the Hammer ability.
Hit the nearby switch to open the path to the orange star door in the background.
Jump into the 3D Warp Star then enter the door.
Light the fuse with the hammer's up attack and solve the puzzle.
On the other side is the Sun Stone.
Enter the bottom right portal next and travel across until you see a peg in the foreground.
Hit it with your Hammer ability.
Fly under the crystal to find the Rare Keychain.
Jump into the top right portal and use the bomb helmet until you switch to the background
and see a key in the foreground.
Blast it down each level and use the 3D Warp Star to return to the foreground.
Destroy the blocks around the locked door and then return to the background with the
key to grab the Sun Stone.
When you get the Hypernova ability, suck up each mini-boss along the way until a Warp
Star appears.
Take it to reach the next Sun Stone.
Continue on until the three Wheelies appear.
Destroy them all to materialize another Warp Star and go left to find the Sun Stone.
Stage 7 will be unlocked once you collect all of the Sun Stones in Royal Road.
When you reach the area with the ice blocks and spring hands, use the Fire ability to
burn away the ice.
Go underneath to reach an orange star door.
On the other side, quickly make a hole in the ice and grab the Sun Stone before the
back wall drops.
Carefully navigate the hanging boat section with the spinning spikes until you spot dynamite
on the right side.
Quickly work your way across in the boat while avoiding the spikes in order to place the
dynamite at the stone.
Go through the orange star door on the other side.
Grab the laser pole and destroy the large stones without touching the small block holding
the chest up.
Once you clear them away, jump in the 3D Warp Star and collect the Sun Stone from the chest.
In the rotating wall section in the lava area, grab the Fire ability to melt the nearby ice.
Next take the Ice ability and carry the key to the right side.
Unlock the door and cool the lava blocks before taking the Rare Keychain.
You'll find the last Sun Stone soon after defeating the mini-boss.
In Stage 8, make your way through until you reach the wall scroll.
Unravel it to find the Sun Stone near the level exit.
Float over the moon on the scroll and push up to go into a secret room.
You'll fall quite a ways before spotting the Rare Keychain over another level exit.
Now that you've collected all 100 Sun Stones, you'll be rewarded with the last Rare Keychain.