"Legit" way of finding secret levels?

[Madnesis]

Hey everyone,
I finally managed to finish my first run after 16 hours, yay! (about time, right?)
I was playing before and found somehow the secret pizza level in the sewers, no idea how...
Considering that I only found a secret level once and I don't know how, I'm probably doing something wrong in other to access those levels but I don't want to spoil myself. Any tip that should help me finding more of the secret levels?
Thanks.

[eiball]

Car with gold lining + Screwdriver

All chests opened on Drylands (including radiation cannisters) + No enemies killed yet.

Cursed weapon + Crystal caves.

Attack the IDPD from the source.

[Yung Venuz]

Eiballs님이 먼저 게시:

Car with gold lining + Screwdriver

All chests opened on Drylands (including radiation cannisters) + No enemies killed yet.

Cursed weapon + Crystal caves.

Attack the IDPD from the source.

Forgot about
Melting + necro
Golden weapon + MOM + proto chest

[Loona is Hot]

Yung Venuz님이 먼저 게시:

Eiballs님이 먼저 게시:

Car with gold lining + Screwdriver

All chests opened on Drylands (including radiation cannisters) + No enemies killed yet.

Cursed weapon + Crystal caves.

Attack the IDPD from the source.

Forgot about
Melting + necro
Golden weapon + MOM + proto chest

They asked for secret levels not secret characters but good work buddy, keep it up we like enthusiasm here.

[Yung Venuz]

Who Succs The Succubus?님이 먼저 게시:

Yung Venuz님이 먼저 게시:

Forgot about
Melting + necro
Golden weapon + MOM + proto chest

They asked for secret levels not secret characters but good work buddy, keep it up we like enthusiasm here.

Meh secret levels, secrets, he was never going to find them out anyways.

[eiball]

Yung Venuz님이 먼저 게시:

Who Succs The Succubus?님이 먼저 게시:

They asked for secret levels not secret characters but good work buddy, keep it up we like enthusiasm here.

Meh secret levels, secrets, he was never going to find them out anyways.

True.

[Loona is Hot]

Yung Venuz님이 먼저 게시:

Who Succs The Succubus?님이 먼저 게시:

They asked for secret levels not secret characters but good work buddy, keep it up we like enthusiasm here.

Meh secret levels, secrets, he was never going to find them out anyways.

Who Succs The Succubus?님이 먼저 게시:

but good work buddy, keep it up we like enthusiasm here.

[Yung Venuz]

Who Succs The Succubus?님이 먼저 게시:

Yung Venuz님이 먼저 게시:

Meh secret levels, secrets, he was never going to find them out anyways.

Who Succs The Succubus?님이 먼저 게시:

but good work buddy, keep it up we like enthusiasm here.

Yung Venuz님이 먼저 게시:

Meh secret levels, secrets, he was never going to find them out anyways.

[Madnesis]

Ok so currently, you are telling me guys that I should just go and look at the guides because there is no way I would ever find on my own the secret levels + the secret characters (lol @ Yung Venuz xD)

[Yung Venuz]

Madnesis님이 먼저 게시:

Ok so currently, you are telling me guys that I should just go and look at the guides because there is no way I would ever find on my own the secret levels + the secret characters (lol @ Yung Venuz xD)

Yea I never would of known about them without someone else telling me about it but with the 'hints' we gave you, you should be able to get most everything.

[Madnesis]

Yung Venuz님이 먼저 게시:

Yea I never would of known about them without someone else telling me about it but with the 'hints' we gave you, you should be able to get most everything.

Ok got it!
Thanks to you and the other folks