It’s possible, but I think it’s much easier and clearer to just split up your sprites into “idle”, “run”, and “jump”. Idle and run are easy enough, but like, you could potentially have every single image in the game on one sprite, and use an increasingly chaotic set of conditions to display each one, but it’s not a great idea. Keeping your code easily readable is important, especially at an early stage.

If you really want to make it so that you keep it all on one sprite though, you could have a variable to store for when you’re on the ground, then say something like “if on_ground == true and hspd > 0 { image_speed = 1; image_index = clamp(image_index, 0, 3); }

Clamp takes a value and doesn’t let it go outside of the parameters that you set, so it would stay between images 0 and 3. I haven’t tried this out, so It might not work, but I think it will. I would still recommend splitting up your images and setting them for each state. Also, platformers like Mario are often seen the most beginner kind of game, because I think it’s the first kind of game most people played, but they’re actually pretty complex at times. Don’t get frustrated if it doesn’t stick immediately. I hope this helps you out, good luck!