Dooyong were most famous for their shmups, but actually started out with this puzzle game featuring a cute racoon that has to throw crystals into floor sinks while avoiding the skulls. Fruits bring bonus points and the clocks extend the time limit. In between stages cartoon images with the racoons are shown.

The origin of this game is disputed: Arcade-History claims it was originally developed by Nihon Maicom Kaihatsu in Japan and just redesigned by Dooyong, stating the game's rom as a source, but a hex search through the ROM didn't bring up anything to support this4. There is, however, an almost identical Famicom game with different graphics by NMK called Ochin ni Toshi Puzzle Tonjan!. It remains to be clarified, though, if Yam! Yam!? was actually based off an unreleased arcade version by NMK or rather Dooyong's adaption of the Famicom game.

With The Last Day, Dooyong started to do what they did best. It is a rather of-the-shelve vertical shooter, with an upgradeable weapon, smartbombs, and the regular level structure, but it is as solid as they get.

While everything else is good standard fare at best, the game really shines through its background graphics. The amount of detail the designers put into the tiles is amazing, and the sceneries for once look like real places. Often they're modeled after those, even if some monuments seem a bit misplaced. Windmills, the Eiffel Tower and Korean palaces—where exactly is this war supposed to take place?

The Last Day (Arcade)

A puzzle game/poker hybrid. Cards can simply be stacked up to three in the same color, but that only gives 10 points per row. It is much more effective to go for straights, triples or full house combinations. All the while it's necessary to take care of the remaining stack, as the following 3 cards can be swapped through, and the total amount of cards is limited. For every card left over at the end there's a brutal penalty, and should the score sink below zero, it's game over.

Two versions of Gun Dealer were produced, an adult version as well as one for all-ages arcades. The adult game features nudies, the "kids" version manga girls with big guns. Those are of overall better quality than the adult art, and given the theme of the game, they're probably the original ones. But that's not the only change, the cards sets in both versions differ as well, and the all ages-version is much easier.

The adult version was also released in Japan by Tecmo. That release features completely different music from the other two.

Like with Yam! Yam!?, the game is often associated with NMK, and their game Double Dealer could be a sequel. Also, a company called Axes claims to have been responsible for 100% of the code and the sound for a game with the title Gun Dealer (probably still in form of their predecessor Hect Development Division 1, as the company itself was founded only in 1992)5.

A politically somewhat explosive theme at the time, the player in Gulf Storm assumes the role of a military officer on the hunt for the worst Saddam Hussein double ever. On that mission, he doesn't settle with a simple plane, but switches between a speedboat, a helicopter and a motorcycle, all the while wondering where the Iraqi found all those biplanes in 1991.

The game offers all the standard fare once again, all vehicles are controlled exactly the same way and use the same weaponry. Even the art is nothing special this time. Still not a bad game, but somewhat boring.

At first glance, Pollux looks like more of the same, but alternating weapon sytems and several other interesting power ups give it a lot more variety compared to its predecessor. Especially useful are the temporary bullet magnet and autofire upgrade, which reliefs the trigger finger from a lot of stress. Enemy patterns are much more interesting, as well, although the stages can still get a bit long. The bosses consist of several destructible parts, and blasting those off even makes them less of a threat for the reminder of the fight.

Other than Dooyong's previous shooters, Pollux takes place in a science fiction setting, or more precisely in a science fiction movie, as the story about a renegade super computer is shown in a virtual theatre (in Engrish). The overall presentation has been taken up a notch, sprites are bigger now, and this is probably the kind of game president Jeong Jinuk meant when talking about 16-bit performance with 8-bit machines.

This time it's really more of the same. Luckily, more of the same stuff that made Pollux great. Power ups are a bit underdeveloped in comparison, but this lack is compensated for with epic boss battles. Some enemy patterns strangely resemble the classic Space Invaders

Blue Hawk is basically a return to the strange modern/historic melange setting from The Last Day and Gulf Storm, but with all the improvements first introduced (by Dooyong) in Pollux

Sadari ("Ladder") spices up the typical colored block matching puzzle concept by combining it with the ladder game, where one connects lines and then choses a starting point to see where one ends up. The colored blocks are falling down that "ladder" to their predetermined destination, so the player has to be fast and catch them with the cursor to release them where it seems fit. Three blocks of the same color lined up in a row (horizontally, vertically or diagonally) disappear. The game grows hectic quite fast, and only players with the best reflexes will be able to make it very far.

Like so many coin-op puzzle games in East Asia, Sadari features images of semi-nude women in between stages. Other than with Gun Dealer, a non-sexy version doesn't even seem to exist.

R-Shark wasn't Dooyong's last game, but as all that was following were insignificant puzzlers, it nonetheless stands as Dooyongs big swansong. Neverending sprite fireworks, exciting stage design, balanced weapons, intimidating bosses and a soundtrack able to move shmup veterans to tears— every aspect of R-Shark is nothing short of breathtaking, and the game can be put in a line with genre highlights like Dodonpachi with no regrets.

At the beginning the player in the role of a headhunter gets to chose to go after one of 8 interstellar criminals, afterwards the following order is decided by the game. The ship is first armed with a rather weak main gun, which is supported by homing missiles, though. Alternatives picked up on the way are a mighty laser gun and a rocket launcher, all upgradeable. In addition stands an individual super attack for each weapon, that attaches a huge-ass mega gun to the ship when used and replaces the genre standard smart bombs. But despite those screen filling weapons of mass destruction, R-Shark remains just as hard as the next shmup. While not a bullet hell shooter proper, it borders on that territory quite often, especially with the boss fights. The game remains fair at any time, though, and upgrades are in very generous distribution.

Of all the games of this particularly export-strong developer, R-Shark was the first one that stayed exclusively in Korea. Even now, in the days of emulation, the game is either ignored or shunned by the shmup fandom for the most part. It could be argued that it lacked any notable innovations, but to be honest, how many famous 2D shmups do, and are loved for exactly that reason? Some important employees had left the company in 1995 to establish Afega as Dooyong's successor for all intents and purposes.

A stock falling-blocks puzzler with colored bubbles. The backgrounds show paintings of famous artists like Millet or Gauguin.

... and even one more. This time with snowballs and no famous paintings.

In this game, the players chose between three vehicles (a plane, a car and a boat), and then have to maneuver them according to the orders from the game.

And another game that combines standard puzzle mechanics with an unrelated game, this time Snow Pop is expanded upon with a Bingo element. Now some of the snowballs have letters written on them that are used to clear a bingo chart. The player who first completes a line on the chart wins. In between stages waits a bonus round, featuring nude photographs. Feels kinda awkward in combination with the overall cutesy style of the game.