i know i have plan for that. so i decide to cover almost every secret in achievement_apg_r16c sit back and relax have fun

This is an Medium Difficulty secret. you need go to corner mansion. Go to piano thing
go through this place. its a fake wall! go through there. you will be presented with this:

go through you will find yourself on an hell place. here's my guess of road. there was 3 teleporters. which they will lead you to the spawn. Difficulty: Medium

Go to this place(castlewall 2)You need go through trees. Go through this little hole. you will complete the secret.
Difficulty: Very Easy

This is an Advanced Secret. not for Normal Players
Go through Secret window at blu's place
You will ended up with this placeEnter Keypad.
as you can see. you need to type code.
1794
enter this you will find out you are on sanic lands after entering teleporter
(no propelly image taken)
Difficulty: Medium

Go to castlewall's tower
when you come to that place. there's an fake wall. just go through via Crouch Jump.
and you will come to Orange. also known as desert.
For secret pyramid. get top of one of pyramids you will get teleported to that place
second way is go to mario's warp point. there was teleporter for it(Orange City)
Difficulty: Normal/Medium

Go To Library. Go through this secret invisable wall. you would be at it
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1910116534
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1910116587
Difficulty: Easy

Go To Library
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1910116625
go shoot this statue. The Door will open
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1910116678
this is little bit famous because its one of common places to hide.
Difficulty: Very Easy

https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1910116703
if you wondered is possible to die while hanging yourself on r16c?
well. its possible platforms will lower when you touch the trigger at this hanging area.
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1910116737
you would stuck in this room until you die
Difficulty: Normal

On R15 there was trap escape room which you can rescue players who got trapped in trap room.
simply hit the table at library on top of it. which would teleport you to that place.
sadly i dont know how to do it on R16c

Go shoot this Wall
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1910116777
On classic one you need go to C House and hit corner and door for Crate room will open
second way to get into crate room is use the warp point mario's warp point (crate room)
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1910116811
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1910116845
To get to Egypt Hallway
You need must get to Top of This Box over there
later you will got in!
Difficulty: Normal

Can be used Once. it still spawns but requires some long time.
This will teleport you to warp room. which you can teleport
to various locations
Difficulty: Medium