GeminiDefense

Nine planets under siege. One defense line stands between invasion and extinction. Gemini Defense is a sci-fi tower defense game where your battlefield layout shapes the fight. Build a maze, combine specialized towers, and hold your ground against alien swarms and planetary bosses. BUILD YOUR OWN DEFENSE Place towers between waves to shape enemy routes while keeping a path open. Balance firepower, crowd control, and protection before the next assault begins. CREATE YOUR ARSENAL Combine cannons, sustained lasers, freezing shots, flamethrowers, sniper fire, and explosive missiles. Complete the free shield briefing to unlock the protective Holy Tower. Poison and Thunder towers are available through their respective difficulty expansions. EVOLVE WITH PURPOSE Earn research stars by advancing through new campaign waves and securing victories. Develop towers across three evolution stages, or downgrade them to reclaim research points and try another strategy. Battlefield gold is used separately to deploy your defenses. SURVIVE THE SWARM Fight through 22 waves in each planetary campaign. Boss waves bring larger, faster enemy formations before the commander arrives. Enemy attacks can destroy your towers, so every position matters. Call in bomber support when the defense line is under pressure. EARN YOUR WAY INTO ENDLESS Complete all nine planetary campaigns on Void difficulty to unlock Endless mode on a larger battlefield. Face enemies from across the system, expanding portal threats, and multiple bosses with independent abilities. FREE TRIAL AND OPTIONAL EXPANSIONS Play the first two planets on Normal difficulty for free. The Campaign Expansion provides access to planets 3-9, which unlock through campaign progression. The Fel Expansion unlocks Fel difficulty and the Poison Tower. The Void Expansion unlocks Void difficulty and the Thunder Tower. Fel and Void do not include the Campaign Expansion. Access to planets 3-9 requires it separately. Endless mode also requires completing all nine campaigns on Void difficulty. No game account registration is required. Progress is saved locally on your device. Purchases can be restored through Settings > PLAYER > RESTORE PURCHASES; restoring purchases does not restore gameplay progress. English is the default language, with 16 language options available in Settings.