Grinexx

Grinexx is the boss of Turtle Rock in The Legend of Zelda: A Link Between Worlds, replacing Trinexx in The Legend of Zelda: A Link to the Past. Like Trinexx, it is a giant stone tortoise with an extending neck, but unlike Trinexx it is volcano-themed and has only one head. It is fought on a rectangular wire mesh platform suspended over lava, with the platform having five large square holes (one in the center and one in each corner) and a lava geyser erupting intermittently on the center of each of the platform's sides.

At the beginning of the battle, Grinexx emerges the top of its volcano-shaped shell from under the magma. At first, it swims passively around the various holes underneath the platform. To damage it, Link needs to use the Ice Rod to drop ice on it when it is under one of the holes. Every second hit against it prompts it to angrily chase Link while erupting its shell for a short period. After the fifth hit, it leaps onto the platform, with the holes on the platform and the hole on its shell closing.

From here, Grinexx has two main attacks, being extending its neck at Link and spinning around chaotically in its shell. Attacking its head can damage it, though attacking it enough consecutively without first stunning it will cue it to retaliate by ducking into its shell and releasing an explosion of steam around its body. To stun it, Link can cool one of the lava geysers with the Ice Rod and trick it into bashing its head against it. As it takes more damage, it become more aggressive, lunging its neck twice in a row and using its spinning attack more frequently. After enough damage, Grinexx explodes and the painting of Impa emerges from the lava.