The Spiny Shroopa is the Shroob version of the Spiny which is found in the Vim Factory during the events of Mario & Luigi: Partners in Time. A Spiny Shroopa has a purple shell with pink spikes. Unlike Spinies, Spiny Shroopas stand on their hind legs. Small, gray arms stick out the front of a Spiny Shroopa's shell. A Spiny Shroopa's head is not visible; only its glowing yellow eyes are visible. To move, Spiny Shroopas use their hind legs to move from place to place.
In battle, a Spiny Shroopa attacks by charging into its enemy. To counter-attack, Baby Mario and Baby Luigi can hit the Spiny Shroopa with their Hammers. Sometimes, a Spiny Shroopa's charge attack can poison a Mario Bro. Furhermore a Spiny Shroopa charge attack may be knocked to where they attack and not end unlike others and thus this means that if done with correct timing, it will take double damage from the hammer. If Baby Mario and Baby Luigi aren't present during the battle with the Spiny Shroopas, the Shroopa will, rather than leaping at one of the adults, roll into its egg shape and roll toward Mario where it is dodged by jumping. Spiny Shroopas are also featured in the hammer attack tutorial.
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