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88% positive of 54 ยท Very Positive ยท Live from Steam
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Firewall, vaccine, cleaner... Place various blocks to protect your CPU! Vaccine A is a sandbox defense game, filled with parody of various programs.
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Review score: 88% on 2026-11-01 โ 88% today (54 reviews)
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Every build released on Steam for this game since we started tracking it, with the developer's patch notes. Updated within minutes of each new build.
System change -Added system message when downloading Virabot.exe Balance adjustment -Hyperlink with more than 3 range get +1 cost Bugfix -Fixed a bug where clicking on an empty area in the link settings screen would cause a crash when more than one page was avโฆ
Bugfixes -Fixed bug that Healing exact frame when you die in millennium bug fight causes glitch win -Fixed bug that x/4 Vaccine A's attack crashes game when it hits encrypted type mob for 5th hit
System change -Added progression bar to Millennium Bug Bugfix -Fixed bug that when selected block destroyed, game crashes.
2.1.2 update!The New Year has arrived! Headquarters is buzzing with New Year preparations!..Hey M, donโt you smell something burning?(New Year event can be played during January!)-And more...1 design changeAnd 2 bug fixes!Have a happy New Year! Chirp.
System changes -Vaccine C's turret now shoot targeted enemy first -Added modpack icon in gamefile selection window. Hover mouse over it to check what mods applied to it. Bugfix -Defeating Straw hat after Digital Piracy's gone will no longer cause crash. sorry โฆ
2.1 update!We are back with new 'Modpack' system, and Vaccine V & Perks reworks!-ModpacksNow you can apply various mods!What if your web browser were Firefox..? What if you could have a cute goose..? Or... what if you could defeat Registry Editor and go on a rโฆ
Reached 50 reviews, with 90% very positive! Thank you for playing!
2.1.3 update!-CPU bonusVaccines now gain additional effects when they are near the CPU!You can also increase the CPU bonus range in the Registry Editor.-New featureYou can now return to HQ from the Network Card!All diagnosis will be cancelled, so use this onlyโฆ