Guys I found a trick to make your sprites gray
1: grab a change color effect block
2: grab a division block and put it in the change color effect block
3: type the number 1 on the left on the division block
4: click on the block to test it and now your sprites are the color gray!!!

While cool tricks like this could help, this is not the forum type for this. Maybe show and tell or something could fit this better. (Idk which fits best because i only scrounge around Help with Scripts anyways).
BUT, if someone needed a way to grey a sprite mid game then you could tell them this trick

Gamingcat12345 can you help me make a mobile friendly platformer?

Oh yeah totally. If you go to my “Tools” studio (The link is in the signature under my post) then you'll find a few things. Among them is a joystick if you want a game with movement. If its something else I can still help.

What do you want to make? It's hard to help if I don't know what I'm helping with. Maybe a mobile racing game? A card game like Uno? A mobile platformer?

Cool, but this is not the right forum, reported for move to show and tell.

It's really nice that you want to help out with a guide! However, we have a number of them in the forums already and we don't have a good way to showcase any more. If you want to make a guide in a Scratch project, that would be fine. You could advertise it in the “Show and Tell” section too.

There are lots of other ways to help out in the forums too. Helpful Scratchers are always welcome in the “Questions About Scratch”, “Help With Scripts”, “Requests” and other sections. Just look around and ask questions