I love that idea, but nobody is motivated enough to restart the community remix. Nobody has time to do it, and we barely have time to work on our own projects. Life likes to get in the way a lot

ClassID 0x1F (Hidden Item Spawner) Findings

Documented by TheGameratorT

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Raw Sprite Data:
AB CD EF GH IJ KL
========================

Notes: Setting both E and J nibbles to 3 locks the item in
place and ignores the coming out of block animation (X Axis).

Nibble AB CD [UNDISCOVERED MIGHT DO NOTHING]
Nibble E
(
Move right stuff:
0 = Spawn coming from invisible block then move right.
1 = Spawn jumping low out of invisible block to right.
2 = Do nothing, useless.
3 = Spawn jumping high out of invisible block to right.
4 = Spawn jumping medium out of invisible block to right.
5 = Spawn jumping medium and falling fast out of invisible block to right.
6 = Spawn falling stairs to right, wut???
7 = Spawn coming from invisible block then move right.

Move left stuff:
8 = Spawn coming from invisible block then move left.
9 = Spawn jumping low out of invisible block to left.
A = Spawn stuck in place, uncollectable. Useful for decoration.
B = Spawn jumping high out of invisible block to left.
C = Spawn jumping medium out of invisible block to left.
D = Spawn jumping medium and falling fast out of invisible block to left.
E = Spawn falling stairs to left, wut???
F = Spawn coming from invisible block then move left.
)
Nibble F [UNDISCOVERED]
Nibble GH [UNDISCOVERED]
Nibble I [Layer Priority] (Spawn item above tiles. 0 = No, 1 = Yes)
Nibble J [Animation] (0 = Coming from block, F = Coming from inventory)
Nibble KL [Spawn Items]
(
Tutorial:
(
How to use?
Get the spawn method offset (it is the first interval number)
and then the ID of the item to spawn. Then apply this formula:

0xOFFSET + 0xID = 0xRESULT

Then remove the 0x and you should get just RESULT as the offset to use.

Example:
If I want a coming out of block Blue Shell do 0x00 + 0x0B = 0x0B -> 0B
If I want a normal spawn Blue Shell do 0x60 + 0x0B = 0x6B -> 6B
If I want a coming from inventory Blue Shell do 0x80 + 0x0B = 0x8B -> 8B
)

Spawn Methods:
(
[00 to 1F] = Comes out of invisible block (up)
[60 to 7F] = Comes out of invisible block (down)
[80 to 9F] = Comes from inventory
)

Filtered IDs (without duplicates)
(
00 = Mushroom (or Fireflower)
01 = Starman
02 = Coin jumping out of block
03 = Mushroom
05 = Mega Mushroom
07 = 1-Up Mushroom
09 = Fireflower
0A = Vine coming out of block (grows until block is hit)
0B = Blue Shell
12 = Entrance Vine (grows 7 tiles and then stops)
19 = Mini Mushroom
)

Unfiltered IDs (with duplicates)
(
00 = Mushroom (or Fireflower)
01 = Starman
02 = Coin jumping out of block
03 = Mushroom
04 = Coin jumping out of block
05 = Mega Mushroom
06 = Mushroom
07 = 1-Up Mushroom
08 = Mushroom
09 = Fireflower
0A = Vine coming out of block (grows until block is hit)
0B = Blue Shell
0C = Mushroom
0D = Mushroom
0E = Mushroom
0F = Mushroom
10 = Mushroom
11 = Mushroom
12 = Entrance Vine (grows 7 tiles and then stops)
13 = Coin jumping out of block
14 = Coin jumping out of block
15 = Mushroom
16 = Mushroom
17 = Mushroom
18 = Mushroom
19 = Mini Mushroom
1A = Mushroom
1B = Mushroom
1C = Mushroom
1D = Mushroom
1E = Mushroom
1F = Mushroom
)
)