A downloadable game for Windows

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This game is inspired by Gyruss, an arcade game designed by Yoshiki Okamoto and released by Konami in 1983.


In the era of Covid-19, scientists finally found a vaccine against the virus and called it Divoc-91. Now it's up to you to guide the vaccine, in the form of a blue sphere, into the human body and eliminate the virus that infects it.


The majority of enemies are virions, which must be killed to complete a stage. They appear either from the center of the screen or from one of the edges, and move in swirling patterns. They can shoot the player's vaccine sphere or destroy it by contact. They hover near the center of the screen after completing their deployment pattern, and occasionally move outwards and shoot at the player. If not killed by the player, the virions gradually move away one by one.
There are also several other types of enemies: microbes, antibodies, and bacteria. These appear intermittently and soon disappear of their own accord if not killed by the player. Microbes appear in a group of three from the center of the screen on the opposite side of the player after the ordinary virions have finished deployment. They move along a predetermined path and shoot at the player. If the player has the basic weapon when the microbes appear, in the middle of them is a flashing vitamin sphere. If destroyed, the player gets a better weapon.
Antibodies fly straight outwards from the center of the screen at regular intervals. They cannot be killed, but a small points bonus is given for shooting at them. Flocks of bacteria occasionally appear from the center of the screen. They consist of 8 units moving rapidly along an elliptical path. Killing them all gives the player some extra points. Every 3 stages a short bonus round is played, where the player can shoot enemies for bonus points without worrying about being destroyed by them. Each enemy destroyed in the bonus stage scores 100 or 10000 for all 40. The player has to pass 24 stages to get rid of the infection completely. Then the game starts all over again at a higher difficulty level.

At 30000 points and then every 60000 points the player earns an extra life.


Arrow keys or joystick lever = Move the vaccine sphere
Ctrl key, Space key, or any joystick button = Fire

You can also use the WASD or IJKL keys as directional keys, and the Z or M keys as fire button.

While playing, press P to pause or Home to stop the game and go back to the title.

While the top scores are showing, press Shift+Del to reset the ranking.


Version 1.0

  • First release.

Version 1.1

  • In fullscreen mode, the game could be jerky using certain video cards.

Version 1.2

  • Now you can use the WASD or IJKL keys as directional keys.
  • Now you can use the Z or M keys as fire button.
  • Now the D-Pad of your gamepad can also be used.

Version 1.3

  • Now there are separate score rankings based on the difficulty level you choose.
  • Now you can use the joystick to enter a top score name.
Updated 25 days ago
Rated 4.5 out of 5 stars
(2 total ratings)
Made withGraphicsGale, Audacity, MonoGame, Bfxr
TagsArcade, covid, gyruss, Pixel Art, Retro, Singleplayer, tube-shooter, virus
Average sessionA few minutes
InputsKeyboard, Gamepad (any), Joystick


Download NowName your own price

Click download now to get access to the following files:

Divoc91_win.zip 37 MB

Development log


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Where do you get the time to make all these? :-D However you're doing it, keep going!

I've created clones of myself that help me out. 😉

Ah, the old C&P.. Good stuff dude.. You nailed the gameplay for all of your games.

very good

Il mio gioco prefirito :) Vengo da asm su amiga e adesso ho iniziato monogame dopo tantissimi anni, ma si trovano i sorgenti per questo gioco? Fantastico propri

I sorgenti può anche darsi che si trovino da qualche parte, non ne ho idea. Per fare Divoc-91 però, ho programmato tutto da zero. Ho giusto pescato suoni e musiche da internet.

excellent remake. Microcosm meets Gyruss... Gyruss music is just perfect too.

I'm glad you appreciate it

Caspita ! Splendida reintepretazione ! Sarebbe stata favolosa anche una versione con la grafica dell'originale.

La tentazione di fare una versione con la grafica originale l'avrei anche, ma ciò che mi frena, e non poco, è che come tipo di gioco non sembra gradito ai più, visto che Divoc-91 risulta il meno scaricato fra i miei giochi. Sicuramente con la grafica originale attirerebbe qualche persona in più, ma non credo che farebbe la differenza. In futuro, però... non si sa mai. Grazie comunque per i tuoi apprezzamenti incoraggianti.