Tranquilizer Gun is a multi-directional shooter arcade game that was released by Sega (in 1980); it runs on their Vic Dual hardware, and the player must use a four-directional joystick to direct a yellow hunter around a maze with a single button to make him fire shots (from that eponymous "tranquilizer gun") at four different types of wild animals (snakes, elephants, gorillas and lions) to knock them out. Once you have fired a shot at an animal to knock him out, the number 30 will appear below him and start counting down - and this means that you will have thirty seconds to bring the animal out of any of the maze's six exits as his truck drives around and he puts him inside, causing the number below that type of animal's head upon the side to go up by one. Snakes are worth 200 points, gorillas 300, lions 400, and elephants 500; you will also receive a 10% bonus at the end of a round if you did not waste any of your shots. The three Katakana characters on the back of that hunter's truck also read as emono (エモノ), which means "game" - but not in the sense "video", as some readers might think.
Tranquilizer Gun involves a maze-like jungle scene with walkable paths and impassible jungle. You can venture into the jungle on foot to hunt the animals and you can also shoot from your truck at any animals that venture out into the 4 edges around the play area where your truck travels. Your task is to tranquilize different animals (snakes, gorillas, lions and elephants). The larger the animal, the more number of tranquilizer darts it takes to put the animal down. As soon as you tranquilize an animal, a timer will begin to count down and you will have to slowly drag the animal back to your truck before the timer reaches zero or the animal will awaken and kill you. Not only do you need to consider the countdown timer for a tranquilized animal, but you also need to watch your trucks fuel gauge, which is basically a time limit counter for the game as you apparently leave your truck running while walking through the jungle.