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Urban Siege Line is a 2D lane shooter set in a ruined city. Waves of zombies move towards your defensive line along three lanes, and you switch between lanes to shoot them down before they break through. There is more to it than shooting, though. You can switch between three weapons, call in air support, deploy a support squad and throw grenades, and between missions you upgrade your armory. Knowing when to save your big tools and when to use them is what gets you through the heavier waves. Missing a lane for too long is usually how a mission is lost. It suits players who like defence shooters with a bit of strategy. It plays with the keyboard on desktop and with on-screen buttons on mobile.
Up and Down arrows: change lane S: shoot 1, 2, 3: switch weapon A: air support D: deploy support squad F: throw grenade P or Esc: pause
A: Three. You move between them to stop zombies in each.
A: Yes, mobile players use on-screen buttons.