I'm sure their is already plans for one but here's my idea and any questions or suggestions please feel free to say them ^{^}

The hidden grotto: Seeing as their are some grottos already scattered around and the sheers are used in 150 for shortcuts

Your guide for the hidden grotto will be mischievous light wanting to help you cause it enjoys seeing you challenge yourself.

So the grotto would start in door 150 after activating anchor a and finding a hidden path, the path will be blocked by a vine wall and you'll need sheers to get in.

The hidden grotto will be more like the library and the nest as in it'll be one big room instead of multiple smaller rooms. Their will be plant based entity's like snare and some new entity's like thron bushes that can be walked through but will do damage and slow, and flowers and the boss of the hidden grotto, the thron.

The thron will be like figure as it can't see you but instead of hearing you it'll be able to sense when plant entity's are activated/harmed and will rush to that area and start to patrol.

Mischievous light will sometimes lead you to the thron to trick you and will mock you when you die but give you small hints on how to succeed next time as it wants you to continue trying.

Items in the hidden grotto would be a bottle of weedkiller (acting like the cross but having multiple uses and can be refilled) the thron will be alreted to anything you use the weed killer on and the thron will only be breifly stunned, some protective pants (they'll be important items so won't take up a item slot) they'll protect your legs from the thron bushes and allow you to walk full speed through them but each damage will decrease the durability (the thron will still be alerted to the Bush being activated)

The objective of the hidden grotto is to find the throns heart on the second floor (accessed via a ramp) inside a hollow tree. the entrance to the ramp will be protected by a thick wall of vines that you can't cut, instead you need to find 5 of the throns eyes which can be found on any tree on floor 1. The throns eye and heart will need need weedkiller (and sheers for the heart). Each time the thron is about to lose an eye it'll come straight to you, as soon as the eye is killed it'll run around wildly in the area having lose sight of you (their will be hiding spots (the hiding spots are like mole tunnels and will take you to a different area).

As soon as the throns heart is killed a thick vine wall protecting a large cave will fall, the throns connection to the plants being severed its eyes will now be revealed and will give chase forcing you from the heart to the cave. After reaching the cave mouth a cutscene will start where figure appears alerted by the throns wails, the player will run towards a nearby hole in the wall and climb inside figure will reach into the hole trying to grab you but won't be able to reach, the throns wailing will attract figures attention and the 2 will fight giving the player a chance to escape reaching a river at the end of the cave the figure covered in leaves will appear forcing the player to jump into the river leading into the sewers where a seek chase will start.

The seek chase will be like the Minecart section but sliding down a river in a sewer. Upto 3 different paths can appear with seek hands appearing out of upto 2 every time and pillars of seek goo will shoot from above (needing to be avoided) and geysers will appear (sometimes the geyser will be seek goo) the geyser will make the player jump across gaps or move up a level (but seek goo should be avoided).

Alternatively during the thron figure clash you'll run to a door leading to floor 180 (the start of the normal seek chase) but instead of their being tunnels to go down it'll be a straight run across multiple pipes. With paths sometimes appearing to the left or right. The thron will appear from the incorrect path coming towards you and vines will appear from sewer grates that you must jump or crouch under to avoid or you'll trip/ fall over.

During both versions of the seek chase guiding light will appear having lost track of you in 150 guiding light and mischievous light will try and lead you in the right direction but only guiding light will take you the right way. Mischievous light is attempting to kill you infuriated that guiding light has found you and trying to make things easier for you

Both paths lead to room 200 where the final boss fight will play out as normal.