Completing Challenges will reveal the surrounding area on the map. Once revealed, the map will help in locating guardians, Portals, and Memory Tokens. There are 27 challenges to complete on Ouranos Island. All of them are needed for 
Ouranos Island Explorer. Below you find all challenges and what to do.
- M-079: Step on the orange plate and after that jump over to the blue plates without hitting the grass.
- M-080: Activate the ball and catch the sphere. You have to look where the sphere drops and go beneath it to catch it.
- M-081: Use the Cyloop skill around the pedestal, now kick the blue ball with
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into all five rings within the time limit. - M-082: You have to use the Cyloop skill around the Tetris blocks. To get them in the right order look at the statue next to the three Tetris blocks on the ground.
- M-083: Get in the middle between both rings, and jump over the laser. Do not get hit until the ten-second timer runs out.
- M-084: Use
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and 
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to get on the highlighted plates within the time limit. - M-085: Activate the hourglass with / and follow the path of blue checkpoints within the time limit.
- M-086: Use Cyloop skill to destroy the blue flames, after destroying the first two, more will appear nearby. Look out for them.
- M-087: You have to use the Cyloop skill around the Tetris blocks. To get them in the right order look at the statue next to the three Tetris blocks on the ground.
- M-088: Activate the hourglass with / , and follow the path of blue goals to complete this challenge.
- M-089: Just catch the blue orb with / .
- M-090: Activate the hourglass with / and use the Cyloop skill two times around the bush next to you to reveal a jump pad. Jump onto the pad and glide through all blue checkpoints within the time limit.
- M-091: Activate the hourglass with / and reach the top of the tower within the time limit.
- M-092: Just spam / on the pillar to deal damage.
- M-093: Activate the ball and catch the sphere. You have to look where the sphere drops and go beneath it to catch it.
- M-094: Activate the hourglass with / and reach the plate within the time limit.
- M-095: Activate the torch in front of you, now use the Cyloop skill around the platform to raise it, get on it and jump over to the other platforms with a torch and activate the torch on each platform.
- M-096: Turn the mirrors so that the laser can reach the pyramid next to you.
- M-097: Use the Cyloop skill around the pedestal, now kick the blue ball with / into all rings within the time limit.
- M-098: Use the Cyloop skill around the yellow glowing tree.
- M-099: Activate the hourglass with / and reach the top of the pyramid within the time limit.
- M-100: Activate the hourglass with / and jump onto the jump pad and glide through all blue checkpoints within the time limit.
- M-101: Step on the orange plate and after that walk over the blue plates that are now highlighted without touching other plates.
- M-102: You have to use the Cyloop skill around the Tetris blocks. To get them in the right order look at the statue next to the three Tetris blocks. If you placed something wrong you can use the Cyloop skill around the wrongly placed statue and try again.
- M-103: Get on the pedestal and parry three energy bullets with + / + within the time limit.
- M-104: Step on the orange plate and after that walk over the blue plates that are now highlighted without touching other plates.
- M-105: Step on the orange plate and after that jump over to the blue plates without falling down.
All Other Islands Challenges:
- Sonic Frontiers – Kronos Island Challenges
- Sonic Frontiers – Ares Island Challenges
- Sonic Frontiers – Chaos Island Challenges
- Sonic Frontiers – Ouranos Island Challenges
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