Hi! This is basically a better version of my interpolation script ( https://scratch.mit.edu/projects/500394370/ ) You can use the arrow keys the move, the deltatime variable measures how many milliseconds have passed since the last frame. For example, if your project runs at the Scratch default of 30 FPS, you'd do one second, divided by the FPS ( 1 / 30 ) and get what you're probably seeing on screen now! The whole point of this is so that you can run projects at ANY framerate, AND BETTER YET, any lag will have everything still running at the same intended speed. The script is super simple, you can find it in "Backdrops"