Release date
Security 51 released on August 12, 2026. The current store pages were checked on August 13, 2026 and show purchase or cart actions.
Official store links
Mode and languages
Steam lists Security 51 as single-player and currently shows 10 supported languages, including Simplified Chinese, English, Russian, French and German. Store language lists can differ by storefront.
Steam Deck support
The official Steam Community FAQ says Security 51 is fully playable on Steam Deck. A touchscreen or trackpad-based cursor is currently required, so this is not a claim of native controller-only support.
Current review signal
Steam currently shows Mostly Positive with 460 purchaser reviews (71% positive, checked September 20, 2026). GOG review counts were not re-verified on this date. These are dated storefront snapshots, not permanent ratings.