Dogyuun is an arcade Shoot 'Em Up made by Toaplan in 1992.
The plot is somewhat vague, except that it involves two pilots destroying aliens after an alien mecha kills the reconnaissance ship leading them.
One interesting feature of the game is the ability in Co-Op Multiplayer for player 1 to combine with player 2, producing a larger ship with better firepower. The game also features loads of homing lasers and large bosses. It was also the first game to feature the astounding graphical designs of Junya Inoue.
This game displays the following tropes:
- A.I. Breaker: The easiest way to beat the scorpion boss is to have the red weapon, destroy one of its claws, that stay in the top corner on the same side as the destroyed claw. None of his attacks will be able to get you, and your red homing laser should be able to damage him.
- Attack Its Weak Point: The second boss can only be damaged when it opens its chest to charge and fire out a Wave-Motion Gun.
- Awesome, but Temporary: The mecha that you get to pilot in the final stage. It's by far the best powerup, making you completely damn invincible, and punch through other mecha enemies like nothing. However, it disappears right before the final boss.
- Bat Out of Hell: You face several bat mechas in stage 6.
- Battle Boomerang: Third boss uses two of them while holding them in a Badass Armfold.
- Beam-O-War: If you have the blue weapon, you can try to counter the second boss' Wave-Motion Gun with yours. You'll probably lose, though, as he fires two while you only fire one.
- Combining Mecha: Player 1 can combine with player 2, forming a larger plane with stronger firepower.
- Cool Bike: One of the enemies in stage 7 is a mech on a motorbike.
- Corridor Cubbyhole Run: Stage 5's boss. He sends these shield things◊ that block your shots — do bit destroy these quickly, as he'll send down a massive wave of energy that will be blocked by them◊.
- Direct Continuous Levels: Present for each level. One neat feature of the game is that you actually fight some of the previous stage's enemies at the start of the next stage.
- Disc-One Final Boss: Subverted with the golden robot which kills your friend in the intro, and escapes in stage 1. Although it does look like a Big Bad or The Dragon, is golden in colour, and is the prime reason why you're fighting, it's only the second boss out of 10 stages.
- Endless Game: The game is supposed to loop indefinitely, but the game crashes at the start of stage 5-1, meaning only 4 loops are actually available.
- Fake Ultimate Mook: The first Mini-Boss. You fight this huge thing right after the first wave of Mooks, but it goes down very quickly.
- Feathered Fiend: The Mini-Boss of stage 4 is a giant robot eagle that can extend its talons to crush you.
- Game-Breaking Bug: Quite a few:
- If the Stage 3 boss is defeated while it's using its laser attack, the laser will persist and continue to crawl around the screen until the player dies.
- The Stage 5 boss might trigger a crash and reset the game.
- The Stage 7 boss will crash into the ground upon defeat. However, its hitbox is still active and despite now being on the ground, flying over those remains can kill you.
- Humongous Mecha: Many of your foes are these. You get to pilot an invincible one at the start of the final stage. And it is awesome.
- Kill Screen: The game is supposed to loop indefinitely, but it freezes at the start of the 5th loop, effectively turning it into a 4-loop game.
- Nameless Narrative: Most of the characters have no names to them. The only character to ever have a confirmed name is Gaowing, the golden robot that kickstarts the plot.
- Ninja Pirate Zombie Robot: The boss of stage 8 is a zombie robot thing.
- Nitro Boost: The blue attachment allows the player to move quickly by holding down the second button. There is no drawback to this other than making you more prone to colliding with enemy fire.
- Numerical Hard: Enemies get more health every time you complete a loop. They do give out more points, however.
- One-Hit-Point Wonder: The player character is destroyed in one hit. If both players are combined, one landed hit will take both of them out.
- One-Man Army: Similar to many Shoot 'Em Up games, the player(s) do get to mow down a few armies worth of mooks and bosses.
- Play as a Boss: In the very final level of the game, the player is given an opportunity to pick up a Power-Up that transforms them into the mech on the title screen. Not only is it completely invulnerable, it also makes very short work of the two enemy mechs that come right up. However, it's rather slow and the powerup vanishes right before the Final Boss is encountered.
- Power at a Price: Combining player 1 and 2 is cool and increases your firepower, but if you are hit, both players lose a life!
- Roaring Rampage of Revenge: Your characters presumably do this after the gold mecha kills their friend.
- Rocket Punch: The minibosses of stage 5 attempt this on you.
- Shows Damage: Electrical currents starts appearing on bosses as their health gets low.
- Smart Bomb: The pink attachment allows the player to use one.
- Spread Shot: The green lightning gun. Many of your foes will use this too.
- Scary Scorpions: The fourth level features many scorpion mechs, the boss is a gigantic one.
- Tank Goodness: The first boss. You also fight several tank-based enemies in the game.
- Token Motivational Nemesis: The game is kickstarted by a huge golden robot attacking and killing the protagonists' friend. He's chased down at the start of the first stage, starting the events of the game... and is only the second boss of ten.
- Unexpected Gameplay Change: At the start of stage 10, you get to pilot a Humongous Mecha via powerup. More lenient tham most examples, though, as the mecha is invulnerable and cannot be destroyed.
- Wave-Motion Gun: The Blue weapon. You start out with this. Stage 2's boss and stage 3's boss also use this on you. Stage 5's boss uses one so massive, you have to hide behind one of his shielder drones to avoid it!