"Jungler " is an action game released by KONAMI in 1981.
Defeat the enemies wandering around the maze-like stage.
If you hit the tail with a shot, the body will become one length shorter.
To defeat an enemy, either erase their entire body with a shot or hit your head against the head of an enemy that is the same length or shorter than you.
If you pick up the "strawberry" in the stage, you can make your body one length longer.