Temporary slow down or speed up?

how do you make a sprite in the game temporarily slow down or speed up when coming into collision with another object?

You can use alternative number blocks to set itself into the number used for character speed.
NumberSet
Like that. ^

ill try it

Or try switching to motors, but you will need a filter to limit there speed.

@Superstargames due to the drawings you made i cant see the lies that attach