They are 2 Golden Portals in each World among the 15 Standards Levels. The 3 special levels "A, B, C" are not involved.

To access these super secret paths, it will be necessary to have unlocked at least some of the Character's Abilities, such as :
• the Flash Boost => unlocked in World 2
• the Wall Jump => unlocked in World 4
• the Fire Dash => unlocked in World 6

For now, in the current version 1.3_8105 (Kohlrabi's Ruin), the Golden Portals are located inside these following levels :

• World 1
  Levels 1 & 13
  
• World 2
  Levels 3 & 15
  
• World 3
  Levels 2 & 3
  
• World 4
  Levels 7 & 9
  
• World 5
  Levels 1 & 10
  
• World 6
  Levels 7 & 10
  
• World 7
  Levels 11 & ???

Here are some Hints to Think, not to Sink. Pick what you need to discover as far as possible by your own energy the solution.

Mysterious Clue : Follow the flow
Abilities Required : Flash Boost with Wall Jump or even Fire Dash with Wall Jump
Access Area : W1-L1

Mysterious Clue : Avoid to touch it
Action Required : Flash Boost or Fire Dash
Access Area : W1-L13

Mysterious Clue : Reverse engineering
Action Required : Fire Dash then Wall Jump
Access Area : W2-L3

Mysterious Clue : Leap of faith
Action Required : Fast Boost and Fire Dash
Access Area : W2-L15

Mysterious Clue : Ping Pong
Action Required : Fast Boost, Wall Jump and Fire Dash
Access Area : W3-L2

Mysterious Clue : Deja vu
Action Required : Fash Boost and Fire Dash
Access Area : W3-L3

Mysterious Clue : Higher up
Action Required : Fast Boost and Wall Jump then Fire Dash
Access Area : W4-L7

Mysterious Clue : Each block matters
Action Required : Flash Boost and Fire Dash
Access Area : W4-L9

Mysterious Clue : Special case
Action Required : Fast Boost and Fire Dash
Access Area : W5-L1

Mysterious Clue : Boinggg
Action Required : Nothing then Wall Jump and Fire Dash
Access Area : W5-L10

Mysterious Clue : Headache
Action Required : Wall Jump and Fire Dash
Access Area : W6-L7

Mysterious Clue : Skimming the clouds
Action Required : Nothing !
Access Area : W6-L10

Mysterious Clue : Create your path
Action Required : Wall Jump and Fire Dash
Access Area : W7-L11

First Gast's Clue : It is not where you expect it to be, this is why it is very well hidden
Second Gast's Clue : It is related to a wall that looks like it holds a secret but doesn't
Action Required : at least Fire Dash
Access Area : W7-L???

Here are the Solutions to Confirm, or to Confess you have missed it by nothing of course.

Exit Point :
Entry Point : W1-L1

Exit Point & Entry Point : W1-L13

Exit Point :
Entry Point : W2-L3

Exit Point :
Entry Point : W2-L15

Exit Point :
Entry Point : W3-L2

Exit Point :
Entry Point : W3-L3

Exit Point :
Entry Point : W4-L7

Exit Point :
Entry Point : W4-L9

Exit Point :
Entry Point : W5-L1

Exit Point :
Entry Point : W5-L10

Exit Point :
Entry Point : W6-L7

Exit Point :
Entry Point : W6-L10

Exit Point :
Entry Point : W7-L11

Exit Point : ???
Entry Point : W7-L???

They are also Sweet Spots designed by the Level Design Team, but no content planned fort it currently :

• W1-L11

• W1-L12

Thanks to Gast for his cooperation, to Istenes for this nice project, and all the other members who have infused their energy into it.

May this Guide have made your journey luminous at his full potential (especially with the Original Cassette face A & B).