This guide shows the location of all secrets.
Basics
Unless otherwise stated, clicking four times on an object will unlock the secret. Click on the object the hand cursor is hovering over (sponge in one case).
Unfortunately, secrets don’t keep, the game ‘forgets’ you have found them after a while (currently, as I write this guide, 15/02/2020).
There are a few times when one secret unlocks access to another and one case in which you need an object before you can unlock a secret, but I’ll write that down where it’s necessary.
Christmas Eve in Metropolis
No secrets in this one, so no entry here, either.
Black Magic Academy
Left side, close to where the level starts
Close to the first secret, a little below and further right
About the middle of the level
To the right and above of the last one, to clear this one, move your mouse across the fogged area as long as you see the sponge without clicking, message here is ‘cleaned’ and not ‘unlocked’
Pirates of the Southern Seas
Left-hand ship, upper left corner of the level
Right-hand ship, pretty much in the middle
The Good, the Bad and the Sexy
Here, almost all secrets are in one vertical line, starting with the UFO
Towards the middle of the level, on the top
Below and slightly to the right of the first one
To the right of the second one
Below the second one
Slightly below the third one, click on the dog
Towards the middle of the level, on the top
Below and slightly to the right of the first one
To the right of the second one
Below the second one
Slightly below the third one, click on the dog
From Transylvania with Love
A little below the starting point
You need to activate the first secret to be able to activate the second one
On the right side of the level, bottom area by the graveyard
Erik the Red ♥♥♥♥ Saga
Top of the level, towards the middle
Lust Island Adventures
Towards the middle of the level
Below and to the right of the first one, by the submarine.
TV Studio Backstage
A little above the starting point
Hardcore Gym Workout
Bottom on the left side
You need to activate the first secret to get to this one
Towards the bottom on the right side of the level
You need to take the plush rat from the dumpster on the bottom of the level to the rat in the lab to activate the screen, then you can activate the secret
You need to activate the prior secret to get to this one
In a Black Hole Far Far Away
A little to the top of the starting position, on the left side of the level
Below the first secret, at about half-height
A little below the second secret
By cayreet