Dragon Quest Heroes: Rocket Slime is an adventure game, and is the sequel to Slime MoriMori Dragon Quest: Shougeki No Shippo Dan. It was released in Japan on December 1, 2005 and in North America on September 19, 2006. It is a spin-off of the Dragon Quest series and stars Slime, a common enemy in the Dragon Quest series as well as its official mascot. The game is played from a top-down perspective. The play begins in the town of Boingburg, where the player can talk to its inhabitants, purchase items, save his or her game and various other tasks. 

Upon leaving the town, the player moves across a map screen to one of several stages; when he leaves a stage, the game lists everything the player has collected, and Rocket automatically wakes up in his bed in Boingburg. Rocket can jump by pressing the A button and glide by holding it in midair. When the A button is held on the ground, Rocket can use the directional buttons to stretch out and then release the A button to snap forward, damaging enemies and knocking anything he hits into the air; this maneuver, called the Elasto Blast, is his main method of attack.

HINTS

Defeating Don Clawleone

First, get your own tank's HP to 0. This may seem counter-productive, but making your own tank die makes winning a lot faster. Once you have killed your own tank, Don Clawleone will try to infiltrate your tank to get to the engine. He has only two attacks, both of which take time to do, so you can kill him easily. One releases a ring of fire that moves too quickly to dodge. The other makes a shockwave of energy that also moves fast but in only one direction. Once you have killed him, the tank will say that this does not change anything, but it actually does. Until he is resurrected, his tank will not shoot anything, leaving plenty of time for you and Slival to fire rapidly. Once his tank dies, rush towards it and Slival will follow. Do not worry about Don Clawleone destroying your tank, as he teleports to you and tries to kill you. Pay no attention to him, as Slival will try to kill him and break the energy rods in your way. He is good at this, because he can break many at once. Once you reach the engine, which resembles a Kaffrizzle item, Slival will try to destroy it, but cannot. You will still have to do it. After that, the tank will explode like any other tank and you will win. He also has drill-like items that prevent you from using your cannons and Kaffrizzles, which release a group of fireballs that can hurt you.

Here's a video of this game: