Dry Bones appeared in the 1988 video game called Super Mario Bros. 3. Dry Bones (also known as Skeleton Koopas) are skeletal versions of Koopa Troopas mainly found in towers and castles. These undead Koopas often collapse when attacked, but they soon revive themselves and become normal once again (however there are some methods to permanently defeat them). Dry Bones first appeared in Super Mario Bros. 3, in which sprites of them are edited Koopa Troopa sprites. They have since become a staple in Mario spin-off games. Dry Bones is ordinarily a lightweight character in games and is often accompanied by Boo. The Dry Bones emblem in spin-offs is a side-view of their heads.