The glow at the edges of the screen shows where are things that you have missed.

• Yellow: Coins (in red areas, they glow red)
  
• Blue: Friends

• Red: Enemies (when accompanied by Scout Glow Chum)
  
• Fruits: Fruits (when accompanied by Scout Glow Chum)

Swim faster.
Some of your friends can disconnect from the end of the queue if you jet. Make sure to collect them afterwards. With the Darter Glow Chum, friends hang on better.

Your friends circle around you to protect you and to help befriend enemies. The more friends you have, the larger enemies you can befriend by bumping into them.
Makes your bump area larger. The more friends you have, the larger your bump area. If you bump into walls, friends can disconnect. Make sure to collect them afterwards.

• Occupation: Rescuer
  
• Description: Mustang weakens enemies with its tail. This seahorse can recover friends stuck to a creature's appendage.

• Occupation: Swimming Champion and Coin Collector
  
• Description: Darter (an avid coin collector) improves Glowfish's jet ability; friends hang on better and bursts are longer.

• Occupation: Sonar Blaster
  
• Description: Sounder will emit a circle of sonic wave that knocks baddies away from you, giving you time to get your bearings.

• Occupation: Explorer
  
• Description: Scout is excellent at detecting foes, and recovering friends from thieves swimming away.

• Occupation: Stealth Specialist
  
• Description: Shade makes Glowfish invisible until there is a collision. Invisibility requires recharge time.

• Occupation: Defense Militia
  
• Description: Leatherbacks defend Glowfish from an attack

• Occupation: Flash Freezing
  
• Description: Frosty's icy blast slows any enemies in its path.

• Occupation: Aquatic Bodyguard
  
• Description: Tap Out strikes at enemies that are smaller than him. It takes a few seconds between each attack.

Usually static.
Follows you, the larger the faster.
Smaller ones merge into larger ones when they are scared of you.
Grabs a friend and swims off with it.
Pinches at you.
Shoots bubbles at you
If you use the defensive circle, it becomes invisible. Latches onto you when it's visible. You can shake it off by shaking the mouse.
Grabs some of your friends depending on its size
Speeds towards you. You can befriend it while it's stunned if it bumps into the wall.
Creates smaller enemies that swim towards you. After a while it becomes vulnerable.
Follows you. You cannot befriend it, it drops coins or nothing.

They look like a shiny dot at first.
If you are in bite range, they can instant kill you. When they start to retract to the background, you can safely swim in front of them. You cannot befriend them.

You can bump into the sides of the moving walls without harm, just don't get trapped between them.
Your friends are safe from moving walls, only you have to get through in one piece.
Note that the walls can move at different speeds, make sure that you get the rhythm before crossing them.
Crystal version
Spikey twigs version

They can push you away if they bite you and disconnect a friend, but do not kill you.
Again, when they are closed, you can safely swim in front of them. You cannot befriend them.

Do not touch them, they can instant kill you. You can swim through the light tentacles, they are just a visual effect. The real tentacles do hurt though. You cannot befriend them.

They can instant kill you, avoid being crushed.

They can instant kill you, avoid touching them. They can be static, swim towards you, contain nothing, coins or friends.

They close and they stay closed.

They drop on you if you don't pass them with a constant motion. Try not to stop when passing them. They can instant kill you.

They can push you away if they touch you and disconnect a friend, but do not kill you. If you move close, they swing towards you. You cannot befriend them.

They can instant kill you. Avoid.

They can push you away if they touch you and disconnect a friend, but do not kill you instantly (if you have friends). They swim towards you if you are close to them. You cannot befriend them.

They do not hurt you, but latch onto you and can drag you into danger. You cannot befriend them.

It can bite you and disconnect a friend, but it can also kill you. You can befriend the bone leviathan. Bump into its tail a few times in defensive circle mode.

It makes you pass out and disconnects all of your friends.

Coins count cumulatively. If you replay a level, you can get them earlier.

Secret areas count cumulatively. If you replay a level, you can get them earlier.

You will have to find everything on the level to receive a four-star rating. This means:

1. Collect all coins
   
2. Befriend all enemies
   
3. Collect all friends
   
4. Finish the level successfully

Getting injured or dying in a level does not make you lose stars.

1. Before swimming into the whirlpool, swim to the bottom right.
   To display the map, press Tab.
   

1. Go past the jellyfishes to the upper right corner
   
2. Before swimming into the whirlpool, swim to the bottom right.
   

1. Go past the angler fish and to the right, there is a passable wall.
   

1. Swim to the bottom left, through the moving walls
   
2. Below the whirlpool, to the right
   

To get the Pacifist achievement, first, finish this Stage to get Darter as a Glow Chum. Level them up. You will not need any number of friends to finish this level, so just boost past enemies until you reach the whirlpool (bottom right).

There is no secret area in Level 5.

1. Go to the bottom left.
   
2. A bit right from that location, there is a passable wall
   

1. Go to the top left. There is a passable wall.
   
2. Below the angler fish, there is a passable wall.
   

After the angler fish secret area, you can get the Walls of Jericho achievement a bit later. For this, move past the twin moving walls, collect the coins. When you try to get back, enemies will appear. Lure them to the moving walls. I got this achievement by accident, so I don't know how difficult exactly it is to do on purpose, it might need a few retries.

1. At the top right, to the right of the angler fish behind the coins, there is a passable wall.
   
2. At the bottom left, after the three moving walls, there is a passable wall.
   
3. Above the large enemy, there is a secret area right above it, past the moving walls (that are not moving at that point)
   

The Lariat Roundup achievement is possible at this level after you pass the bubbles and survive the chasing enemies, there will be a large enemy at the top. Make sure to pop the bubbles that surround it first. However, there will be plenty of opportunities also later on to get this achievement.
To get the Not easily baited achievement, you have to avoid all angler fish. This means two things: It cannot harm or kill you, and it cannot eat any of your friends. If you did everything right, the achievement pops after you finish Level 8. To make this a bit easier, make sure that you only collect enough friends to open the next door, not more. Move slowly, look for the angler fish light, and if you see one, stick to the walls as much as possible. I'd recommend that you take either a fully upgraded Shade for invisibility, a fully upgraded Darter for speed and friend retention, or a fully upgraded Mustang for killing off the blowfish around an angler fish. Don't care about coin collection when aiming for this achievement.

1. At the top left, there is a passable wall.
   

There is no secret area in Level 10.
To get the What's under the hood? achievement, first, finish the race. You'll get Darter as a Glow Chum. Level them up and then race again. Use the defensive circle effect (left click) on your friends and use the upper race track. Bump to the enemies and collect coins as you go. You'll not have to collect everything, just get what you can, while using the Propeller Fruits to boost your speed to finish first.
To get the Incandescent achievement, you have to pass all 10 levels without ever dying. Friends can detach from you, you can bump into non-lethal enemies and walls as long as you don't die.

1. Above the blowfish there is a passable wall.
   
2. Below the whirlpool there is a passable wall.
   

If you haven't received all stars, you might want to revisit this level with the Scout Glow Chum. After around the middle of the map, new invisible enemies will appear at the very beginning of the map and you will have to backtrack a lot to befriend them all. It helps if you see where they are.

1. Around the center of the level, between the moving walls there is a passable wall to the left.
   

1. After you get to the larger open area, swim to the bottom left, there is a passable wall.
   

1. At the bottom, past the twig moving walls, swim left. There is a passable wall.
   

1. To maximize your points in this level, make sure to eat all Propeller Fruits. Swim right then down and left where the coins point. Then where the coin arrow points upwards, wait until the twig walls close, eat the fruit and quickly swim up. A lot of new things will appear and the secret area will open.
   

1. There will be a large open area with three bubble doors. Do NOT enter the top one (with the moving walls behind it). The walls will close after you pass them and will not reopen. The secret area is below it, behind the second bubble wall next to the second house.
   
2. If you have found all enemies (including the chompers), you can open the third bubble wall next to the third house.
   If you do both, you'll have enough friends to open the first bubble door.

1. Swim down the first long shaft. At the bottom, there is a secret area.
2. Swim down the second long shaft. A bit before the bottom, swim left, there is a passable wall.
   Before continuing through the bubble door, don't forget to go back left to the crabs.
   
3. Swim down the third long shaft. To the bottom right, there is a secret area.
   

1. There are no secret areas in Level 8.

1. Near the middle of the map, after a crab, swim left. There is a passable wall.
   

1. To the right of the whirlpool, there is an immense secret area with a ton of additional bubble doors. You will also find the Scout Glow Chum at the end.
   

1. On this level, you'll have to backtrack a lot, because of the lack of friends at certain points. At the bottom of one of the reefs, there is a shallow secret area.
   
2. To the bottom right of the whirlpool there is a secret area.
   

1. Swim down the first shaft and to the right there is a secret area.
   

1. There is no secret area in Level 3.

1. Be careful with the third moving wall, above the house. Save first and then be very fast, because the walls move slow but they never open up again. It's not a secret area, but you can get stuck.
   
2. Swim below the second house.
   
3. Swim down past the jellyfishes.
   

1. To the bottom right of the third set of friends, there is a passable wall.
   

1. Move to the top right after the four moving twig walls, there is a passable wall.
   
2. After more angler fish and moving twig walls, move to the bottom right, there is a passable wall.
   
3. Past the three angler fish, to the bottom right, there is a passable wall.
   

1. There is no secret area in Level 7.

Solve the puzzles and find the hidden enemies.
Solution: In the first area in the dark. Also, under the three red shells, it requires a lot of friends:

1. Puzzle 1 solution: 1-2-3-4
   
2. Puzzle 2 solution: smaller -> larger
   
3. Puzzle 3 solution: 3
   
4. Puzzle 4 solution: The middle one
   

To get the Puzzling achievement, solve all puzzles in this level correctly. You can get it on other puzzle levels too.

1. From above in the middle, swim down between the orange fish eggs, there is a passable wall.
   

1. Right where you start, swim left, there is a passable wall.
   

After you get your first friends, don't forget to swim back to the start for the bubbles.
Solve the puzzles.

1. Find the pattern. Solution: The solution is behind the clams, from left to right. Pumpkin, Blue 6-petal flower, Purple striped egg, Brown star-shaped seaweed.
   
2. Follow the coins in the map, and then above it, in the "real" maze with the moving walls.
   Solution: Starting from the leftmost entrance: up, right, up, up to the friends, down on the third entrance, right, down.
   Visual solution:
   
3. Bubble maze. Move very slowly so that you don't bump into the bubble walls.
   Solution: Move left, then at the crossroads, move up. Then left again, At the next crossroads, move down, then down again. Swim to the right of the whirlpool and up to reach the first Super Nova Fruit to destroy the bubbles. Then move around for the others.
   Visual solution:
   

1. There is no secret area in Level 2. Below the whirlpool there are some extra coins and friends.

1. To the upper left of the three electric eels there is a passable wall.
   

To start, use the Leatherbacks Glow Chums. Destroy all bubbles, because after you move on, the way back will be sealed.
Solve the puzzles.

1. Maze solution: From the bottom, second entrance from the right. Up, left, left, up. Go back the way you came from. Destroy the first bubbles with the Super Nova Fruit.
   
2. Glowing mushrooms solution: Middle, top right, bottom right, bottom left, top left
   

1. Around the middle of the level, move down between the two horizontal geysers. There is a passable wall.
   
2. After you move a bit upwards and right and get to a large open space, swim to the left. There is a passable wall.
   

1. After escaping the bubbles, swim up and right, there is a secret area.
   

1. After bursting most bubbles, there is a secret area to the right.
   

1. Around the middle of the map, below the large area with the invisible enemies, go down. There is a passable wall.
   

1. Collect all coins. Take Darter with you.

1. After the first house to the right, there is a passable wall.
   

You will get the Love Tap and Best Friends Forever achievements after finishing this level. It is also possible to get the Personal Trainer one if you have enough coins at this point.

1. Swim to the left and a bit down, then to the right. There is a passable wall.
   

Houses from left to right (I'd recommend the following order: 6, 3, 2, 4, 1, 5):

1. Eruption (geysers appear)
   
2. Mergers attacking (the bubble door opens)
   
3. Power up fruits can be harvested
   
4. Chompers on the move (chompers appear)
   
5. Success! The Exit is open.
   
6. The secret path is revealed.

1. To the bottom and right to the crystal enemies, there is a passable wall.
   

1. To the bottom left there is a crystal door that opens after you have befriended all enemies in the larger area to the right. Come back, swim down, there is a secret area.
   

1. In the large area with the tentacles, on the left side there is a passable wall.
   
2. Below the two corals there is a passable wall.
   

1. There is no secret area in Level 5.

1. There is no secret area in Level 5.

1. After the third bend, above the pufferfish, there is a passable wall.
   

1. After you get to the area with a few friends and enemies, go left and up.
   
2. From the first secret area, wait until the walls move right and swim to the bottom left.
   

1. After you get friends at the right, go back to the beginning to get all friends. After that, open the first bubble door and swim left.
   

1. There is no secret area in Level 10.

For the Mr. Invincible achievement, I recommend using the Leatherbacks Glow Chums. They will protect you from most hits.