City Siege 4: Alien Siege

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City Siege 4: Alien Siege casts you as a last-line defender on a hostile alien planet. Your goal is to build and upgrade a squad of troops while using a laser gun to hold off waves of enemy units. Resource management and positioning matter as you balance troop training, base defenses, and direct combat. Each mission focuses on rescuing survivors while fending off increasingly aggressive alien attacks. The turn-based strategy layer lets you tweak unit abilities and tactics between waves. This 2012 browser game has a solid replay value thanks to its escalating difficulty and upgrade system. Community playthroughs often highlight the satisfaction of optimizing builds to tackle tougher enemies. While not graphically flashy, the straightforward design keeps the focus on strategy. Players who enjoy methodical base-building and tactical combat without overwhelming complexity might find it holds up better than similar titles from the same era.