Sanctum Shooting aliens while you build mazes

Most tower defense games hand you a fixed path and a row of tower slots. Sanctum lets you build the path itself. You place wall tiles to snake enemies through your kill zone, stretching their walk as long as you can while squeezing in more towers along the way. Every map is a fresh puzzle in route design, and the maze building gives you more freedom than the genre usually does. You decide where the slow chokepoint goes, where the air cover sits and how much money to sink into each piece. Then the wave starts, and you find out whether your geometry holds.

Here is the twist: once your defenses are up, you do not sit back and watch. You step into the map in first person, run between your towers and shoot the creeps yourself. You pick a small loadout of guns each round, so the choice of what you bring matters. It turns a waiting game into an active one: the moment a wave breaks through a gap in your maze, you are the one standing there to plug it.

Co-op supports up to four players, and it changes the whole rhythm of a round. One of you covers the air lanes while another sprints to plug a leaking corridor, and the maze becomes a shared plan rather than a solo puzzle. You divvy up tower money, argue over where the next wall tile goes and call out which wave is about to break through. Sessions are easy to join and built around short, social rounds: hop in a lobby, coordinate a layout, defend, repeat. When the core survives by a sliver, you will all have opinions about whose tower saved it.