Any card that doesn't possess a specific effect that affects gameplay, but is strong enough in DEF points to be a decent defender, is called a Wall. Notable examples include "Labyrinth Wall", "Neo Aqua Madoor", "Millennium Shield", "Big Shield Gardna", and more recently, "Destiny HERO - Defender","Redox, Dragon Ruler of Boulders", "Gachi Gachi Gantetsu" and "Wind-Up Zenmaines".

Cards that cannot be destroyed by battle are also considered walls such as "Marshmallon" and "Spirit Reaper".