Fort Apocalypse on the Commodore 64 is a side-view helicopter action game where you pilot a gunship into a heavily defended underground fortress to rescue prisoners and blow the place sky-high. Starting above ground, you dodge enemy choppers and flak before diving down into sprawling, multi-level caverns packed with gun turrets, missiles, force fields, and tight tunnels that demand careful flying. You land on tiny platforms to pick up prisoners, ferry them back to a safe pad, then push ever deeper to find and destroy the base’s reactor, all while juggling limited fuel and hull damage. It plays like a tense mix of Choplifter and cave flyers, combining twitch shooting with precision navigation in some of the most intricate 8-bit caverns on the C64.