Yoshi and Sluggy the Slugma both woke up from the bedroom in Sluggy's house. Quickly eating breakfast, the two partners snuck in through the back-way, after Sluggy locked all of the doors. Standing on the small strip of the red, magma-hardened ground, Yoshi got on Sluggy (waiting a few seconds to get used to the flames), and then Sluggy slithered into the red, bubbling lava, heading towards the Lethal Lava Volcano.

As the two partners headed in the southwestern direction towards the Lethal Lava Volcano, red-and orange colored, hot fireballs started to pop out from the red, bubbling lava. Yoshi held on tightly to Sluggy as the young Slugma ducked out of the way, tilting to the right as he turned to the right, and jumping above a set of lava flumes rising one at a time from the lava below. landing back down smoothly, Sluggy turned left, and ducked again from an incoming fireball. Yoshi let out a sigh of relief as he and Sluggy managed to make it to the entrance into the Lethal Lava Volcano.

Hopping off of Sluggy, Yoshi approached the gigantic green door, taking out the red, fiery key he received yesterday. Placing it into the keyhole, the door slowly opened, and the green Yoshisaurus and Sluggy both cautiously entered as they left behind them the wide open sea of red, hot, bubbling lava.

Yoshi and Sluggy both looked around the giant interior of the red hot volcano in awe as they slowly walked on the red, magma-hardened path set ahead of them. Yoshi glanced to his right to see yellow-and-orange lava slowly flowing down, looking ahead to see a ridge. Grabbing Sluggy and putting him on his back, Yoshi jumped down from the ledge and landed safely down, putting Sluggy back on the magma-hardened ground. Sluggy smiled, and the two partners made their way through the first part of the volcano. They were, however, wary that several unknown enemies within the shadows of the volcano's tight spots were watching them closely...

Yoshi and Sluggy crept deeper into the volcano, both of the two feeling the heated steam coming on to them. Yoshi kept a close eye on Sluggy, who would fend off any enemies with his fire attacks. As the two approached a complex maze, Yoshi picked up Sluggy, holding the fire-type slug Pokemon. Sluggy looked through, noticing the fire seeping through the red, hot bubbling lava. Putting Sluggy down, Yoshi entered carefully into the complex maze, Sluggy slugging behind.

As Yoshi turned to the right and crept, he was confronted by a fiery set of jaws, which snapped at Yoshi. Yoshi screamed, and he whacked at the fiery set of jaws with his tail, forcing it to retreat into the red, magma-hardened ground. Sighing of relief, Yoshi turned to the left and crept a few feet more, stopping at the next turn and waiting for Sluggy to catch up. Yoshi grabbed Sluggy, and he glanced upwards, climbing up the magma-hardened ledge. He turned around and grabbed Sluggy with his long, red tongue, bringing his Slugma friend upward. Placing Sluggy down on the magma-hardened ledge, Yoshi turned around and started to run on it, turning to the right and grabbing some of his green-spotted eggs, tossing them at the fiery creatures on the ground below them. Sluggy followed closely, firing small balls of embers at the fiery creatures, forcing them to back off. After turning a few more times, Yoshi and Sluggy jumped down from the ledge (with Yoshi carrying Sluggy on his small, red pad) and both went through the hole entrance, heading through a small and narrow path going through the giant volcano.