Varth: Operation Thunderstorm (バース オペレーション サンダー ストーム) (occasionally known simply as "Varth") is an arcade game in the vertical scrolling shooter genre, developed and published by Capcom in 1992. The game did not see a console port following its initial release, but 14 years later Digital Eclipse Software would port the game onto the PlayStation Portable handheld, in the Capcom Classics Collection), and later onto the PlayStation 2 and Xbox and Nintendo Switch on Capcom Arcade Stadium.
Varth' gameplay draws very heavily from 1942 and other games in Capcom 194X series. The goal is to destroy enemy units while avoiding being hit, and reach the end of the level, occasionally ending with a boss fight. There are 30 levels in the game. One hit from an enemy will cause the player to lose a plane. The biggest difference between Varth and most other shoot'em up games of its time is the inclusion of items called "Pods". When a player picks up a pod item, a pair of pods will follow the player and carry weaponry of their own to supplement their artillery. Additionally, pods can completely block most (but not all) forms of attacks from enemies, rendering the player almost invulnerable to attack from any direction in which the pods are situated. Players can choose from two formations for their pods - fixed or smart. In fixed mode, both pods remain directly in front of the player to render the planes invulnerable from the front, but leave them open on the sides and from behind. In the smart position the pods will remain separate from each other at a 180-degree angle, and move about according to the direction of incoming fire. If enemy fire manages to slip between the pods before they can react (potentially common in later levels as large numbers of enemies appear on screen), the player is left vulnerable and only has the option of moving in hopes of avoiding a hit.
Varth features three different weapons for the player - a laser (long rate of sustained fire but lowest horizontal range), a Machine gun (relatively powerful with a potential range as wide as the player's craft), and multi-directional shot (very wide range but lowest sustained rate of fire). Additionally, three different types of pod weapons are available - homing missiles (weakest weapon but with a useful homing advantage), missiles (more damaging than homing missiles but can only fire forward), and napalm (powerful but with very low range). Like the 194X games, Varth also features bombs which allow the planes to perform "mega crashes". The type of mega crash a plane can do is determined by the weapon it is carrying. Lasers will result in an electricity attack that will cover the entire screen. The Machine gun will fire missiles which will move from target to target. The multi-directional shot will fire a single large burst that moves directly forward from the player, then emanates many smaller bolts on reaching the top of the screen.
The game also features several items which can help the player in other ways, such as point-yielding icons, items which will increase the power of the player's arsenal, additionally bombs, and items that will destroy all enemies on a screen. Perhaps the most useful item is the Yashichi, which will instantly upgrade a player's weaponry to its highest level.
Varth follows the story of a disaster that befalls a human colony on a planet of the same name. The entire colony is run by a 7th generation supercomputer which controls the operations of all machinery on the planet. Unfortunately for the residents of Varth, Delta-7 has been possessed by the entity "DUO" (Dimension Unbody Offender), thought of as an evil spirit but actually a temporal-spatial consciousness which spontaneously arose within the supercomputer. DUO has come to the conclusion that human existence is inimical to the planet, and has therefore turned the planet's defenses against its own populace. Eighty percent of the planet is laid waste by the event, and this is only the beginning of DUO's cleansing scheme. The colonists' reliance on the supercomputer has caused them to lose the ability to take care of themselves, and thus have no means of fighting back. The only hope for the colony lies in the pilots of two planes equipped with 4th generation computers which DUO cannot control—they are controlled not by machinery, but by humans.
- Casber Rublan - A fighter for the resistance. One-time B+ class pilot. Quite the comedian, his quick wit and unique style are well-loved by his friends. A little on the slim side, he does not fit the stereotypical "soldier" mold. Casber usually wears the liberation bandana around his head. His fighter plane is the Tanikura F7W Saber.
- Felry Carnihum - A fighter for the resistance. Former acrobatic flying instructor. The daughter of a pilot, Felry has been flying all her life and piloting her own plane since she was a teenager. She greatly distrusted the complete control which man was giving to the machines and her distrust was proven accurate. A talented engineer, she joined the reconditioning team to prepare the two planes. She has no battle experience, but sports a unique style of flying. Her fighter plane is the Dakao M-2451 Scimitar.
- Perhaps the most well-known cameo in Varth is in the fourth level. By a section of grass and pipes on the satellite's lower-right section, Ryu from the Street Fighter series will appear and perform a Shoryuken. Continuing to fire on Ryu until he disappears will yield a large amount of power-ups.
- The Player One character from Side Arms Hyper Dyne appears as an item that will destroy all on-screen enemies when collected.
- Capcom's signature Yashichi item, originally from Vulgus, makes an appearance in Varth as a power-up that raises a plane's weaponry to its maximum level.
Planner: Vally Dack Kelbon, Natural Sai Sai, Nijigen Mouri, Odds Maker Maetake
Scroll Design: Kintaro, Kuramoyan, Maru Chan, Mon Chan
Object Design: Kurata N, Manbou, Hanisawa, Ume
Programmer: Ohuchi, Meijin T, Hac, Ecchiro Okosama, Komorichie Darkside
Sound: T Yomage, P, Bull
Special Thanks: Mikiman, Haruchan, Iwai, Yokozo Yokota, Yusuke, Scott Madman Maxwell, Sho, Sadamoyan, Blbon, Mushikae Wakky, Erlingr Ogachy, Hekoki Ant Zaby, CBX
Director: Kihaji, Poo, Nin
Presented by: Capcom