i have tried many a code, but none work. i want the speed to go like 50 or something so that the character can jump over big holes like that speedrun game. ive edited the huminoid speed directly but when i die it gets set back. i really need help.
You haven't really attempted to make a script of your own, but I'm going to give you the benefit of the doubt and assume that you're asking how such a thing would be done. This isn't a site for requests. It's for asking for methods on how to do a thing, or after making an attempt come back with your script for error checking.
You'll want to use the PlayerAdded event of game.Players, and on every player use the CharacterAdded event, this code will run every time the player respawns, and you can set the humanoid walkspeed in that chunk of code. Character Added passes the character through it's connected function so you can use that argument to find the humanoid you're changing the walk speed of.
create a script in "starter character" scripts and do something like this
script.Parent.Humanoid.WalkSpeed = 50 script.Parent.Humanoid.JumpPower = 75
even if you die, you'll still be the same speed. I'm guessing you're fairly new to scripting helpers but it's recommended to put up a script of what's wrong it's not a request site.