Actually Scrooge, there are prices listed for the items in the item shop. That is what the message block is for, but if you must know the prices here: mushrooms are 10 coins, flowers are 30 coins, and feathers are 50 coins. The item shop is also the only place to get feathers. As for the upside down level, yoshi has never heard of or played Cookie Crisis. The hacks yoshi has played are:
-Mario's Keytastrophe (One of the best hacks I've played)
-Mario's Amazing Adventure
-Super Mario Infinity
-Super Demo World: The legend Continues
-Chaos Complexx (That was a funny hack)
-The Second Reality Project Reloaded
-Evil Maze
-Super Mario World Master Quest
-Yoshi-Dawn of Darkness Demo
-Item Abuse (That hack is the only hack not found on this site)
If yoshi gets inspired to do something in Super Mario World Custom 2 from another hack. It is most likely going to come from one of the above hacks (probably not Item Abuse, though)
(As for your last comment, I am not trying to annoy anyone. I already said why I chose to write this way in an earlier post. I am being careful with what I write outside of parenthesis, so that it isn't confusing to read. Here is an example of something I won't write outside of parenthesis: "Yoshi thinks yoshi is cool." Am I talking about yoshis in general or am I refering to myself? If I were to write something like that, I would write it in parenthesis like this: "I think yoshi is cool" or "I think I am a cool person." If I write something that would be too hard to understand in third person, then I will write it in first person inside of parenthesis, like I am doing right now.)
Update: Yoshi just discovered that yoshi made a huge mistake with version 1.1 of yoshi's hack. Yoshi forgot to move mario's sprite off of the test map. That map is where yoshi tests new levels before giving players access to them.. Yoshi is so sorry to anyone who downloaded version 1.1 of yoshi's hack. Please do not download the hack until version 1.2 is up.
Update: Yoshi just submitted v1.2 of yoshi's hack. Which fixes the fatal flaw and a couple other things. From now on, yoshi will start a new file and play through the whole hack before submitting it, even if yoshi has already tested all the levels, just to see if mario goes to the test map. Yoshi is still very sorry for that and yoshi will make sure it never happens again. If any of the moderators are reading this, go right ahead and nuke the original version and v1.1 of yoshi's hack. V1.2 has all the updates v1.1 has, but without the fatal flaw v1.1 had.
Edit: A moderator has just deleted the original and v1.1 of yoshi's hack. So now, only v1.2 should be available.
My Hacks:
Mario's Strange Quest V1.6
Yoshi's Strange Quest V1.3 /
V1.3.1 Beta 4.6
Mario & Yoshi's Strange Quests (2/10/2023 Build)
Other stuff:
My SMW/SMAS/SMAS+W disassembly
Yoshifanatic's Discord Server: A place for fans of my stuff and/or Yoshi to chat with others.