I am making a 2d platformer on buildbox3, is there a way to make a character transform with a power up and stay in that form until the level is over?
Yes but you will need to add a new animation for that power up, and switch to it for the during of the power up. Or you could change the colour of your character, or add some objects etc to make it look different, then use the timer to remove them
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Just play the animation - if it's 2d. So when your character collides with the object, it plays the animation.