I'm struggling to make a Platformer without my character bugging to the top of my screen and staying stuck there. My character also just gets stuck on the side of the platforms, and I'm trying to figure out how to make a walk animation. (i already have designs for walk) Any tips?

Here's the core physics system you need:

when green flag clicked
forever
    if <key [left arrow v] pressed?> then
        point in direction (-90)
        change [x velocity v] by (-1)
        set [x velocity v] to ((x velocity) * (0.8)) // friction
    end
    if <key [right arrow v] pressed?> then
        point in direction (90)
        change [x velocity v] by (1)
        set [x velocity v] to ((x velocity) * (0.8)) // friction
    end
    if <key [up arrow v] pressed?> and <touching [Ground v] ?> then
        set [y velocity v] to (12) // jump strength
    end
    
    ...// Apply gravity
    change [y velocity v] by (-1)
    
    ....// Move horizontally
    change x by (x velocity)
    if <touching [Platform v] ?> then
        change x by ((0) - (x velocity)) // undo movement if collision
        set [x velocity v] to (0)
    end
    
    // Move vertically
    change y by (y velocity)
    if <touching [Platform v] ?> then
        change y by ((0) - (y velocity)) // undo movement if collision
        set [y velocity v] to (0)
    end
    
    // Animation
    if <(x velocity) > [0]> or <(x velocity) < [0]> then
        next costume
        wait (0.1) seconds
    else
        switch costume to [idle v]
    end
end

Key Fixes for Your Problems

// 1. Prevent Top-of-Screen Sticking

// Add this to limit vertical movement
if <(y position) > [180]> then // near top of screen
    set [y position v] to (180)
    set [y velocity v] to (0)
end


// 2. Better Platform Collision

// More precise collision checking
define Check Collision
set [safe move v] to [yes]
change x by (x velocity)
if <touching [Platform v] ?> then
    set [safe move v] to [no]
    change x by ((0) - (x velocity)) // go back
    set [x velocity v] to (0)
end


// 3. Walk Animation System

when green flag clicked
forever
    if <(x velocity) > [0.5]> or <(x velocity) < [-0.5]> then
        if <(animation timer) > [0.2]> then // control animation speed
            next costume
            set [animation timer v] to (0)
        else
            change [animation timer v] by (0.1)
        end
    else
        switch costume to [idle v]
        set [animation timer v] to (0)
    end
... // end
end

more tips:

- Animation Basics: https://en.scratch-wiki.info/wiki/Animations

Thanks bro

can you help me with this I want to make wall jumping https://scratch.mit.edu/projects/1204792691