The ball may only bounce once on the floor
Padel rules · Play
You must return the ball before it bounces on the floor a second time. A second floor bounce loses the point — wall rebounds do not count as floor bounces, so a ball can bounce on the floor, hit the back glass, and you still play it.
📘 Category: Play. This is one of the rules that most often confuses players coming from tennis or pickleball.